Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation (Details)

v3.3.0.814
Stock Based Compensation (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Oct. 17, 2014
USD ($)
Oct. 10, 2014
shares
Jul. 01, 2014
shares
Oct. 31, 2014
trading_day
$ / shares
shares
Oct. 31, 2013
trading_day
$ / shares
Mar. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
shares
Jan. 16, 2013
shares
Jan. 15, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options             223,123 452,493    
Fair value of stock options vesting | $             $ 132 $ 1,200    
Stock options exercised (in shares)             61,849 34,375    
Number of stock options forfeited/canceled             427,969 16,250    
Number of stock options expired             12,499 0    
Issuance of common stock (in shares)             34,112      
Common shares from options exercised, net of shares withheld for tax obligations (in shares)             34,112 28,877    
Cash received from the exercise of stock options | $             $ 115 $ 201    
Share-based compensation expense | $             891 2,000    
Unrecognized stock compensation expense related to options granted | $             $ 900      
Weighted average cost recognition period             1 year 4 months 17 days      
Additional options expected to vest             20,624      
Unvested options forfeited             238,907      
Shares repurchased during period | $             $ 1,445      
Repurchase of common stock | $             566 $ 11    
Non-employee Directors                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock options exercised (in shares)     2,734              
Share-based compensation expense | $             $ 264      
2012 Stock Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized                 625,000  
Expiration term             10 years      
1998 Stock Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized                   36,054
1998 Stock Incentive Plan | Former Executive                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock repurchased from former executive   31,250   189,062     189,062      
Number of stock options forfeited/canceled             189,062      
Shares repurchased during period | $ $ 1,400                  
Repurchase of common stock | $           $ 983 $ 462      
Former executive office ownership, percent, more than   5.00%                
Amount of withholding taxes | $             $ 318      
RSUs | 2012 Stock Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Maximum number of shares allowed to be issued each year                 62,500  
TBOs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options             16,875 77,493    
TBOs | 2012 Stock Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options             16,875 77,493    
PBOs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options             156,250 187,500    
PBOs | 2012 Stock Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options       156,250     156,250 187,500    
MBOs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options             49,998 187,500    
Number of consecutive trading days | trading_day       10            
MBOs | 2012 Stock Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options       49,998     49,998 187,500    
Vesting Period       3 years            
Per share closing price (usd per share) | $ / shares       $ 40.00 $ 18.80          
Number of consecutive trading days | trading_day       90 10          
Median stock price (usd per share) | $ / shares       $ 40.00 $ 18.80          
Other Options                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options             0      
Prior Period Awards                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Amortization expense | $             $ 555      
Employee Stock Option                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense | $             (648)      
Amortization expense | $             $ 708      
Employee Stock Option | 2012 Stock Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Maximum number of shares allowed to be issued each year                 125,000  
Market based or performance based options, not vested (in shares)             332,028      
Market based and performance based shares available for future issuance (in shares)             169,453      
Employee Stock Option | 1998 Stock Incentive Plan | Former Executive                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock repurchased from former executive   189,062                
Common Stock | Non-employee Directors                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Grants in period (in shares)     12,041              
Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense | $             $ (67)      
Restricted Stock | 2015 Incentive Compensation Program                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense | $             $ 79      
Restricted Stock | 2015 Incentive Compensation Program | Executives                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Grants in period (in shares)             12,500      
Restricted Stock | 2015 Incentive Compensation Program | Chairman of the Board                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Grants in period (in shares)             6,250      
RSUs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unvested RSUs forfeited             17,500      
CO2-EOR Pilot Program at Poplar | 2012 Stock Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance metrics weighted average         10.00%          
CO2-EOR Development Project at Poplar | 2012 Stock Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance metrics weighted average         40.00%          
CO2-EOR Development Project at Poplar | PBOs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance metrics weighted average       20.00%            
Sale of Substantially All of the Amadeus Basin Assets | 2012 Stock Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance metrics weighted average         20.00%          
Approval of a Farmout Agreement or Participation in Drilling a Well in the Weald Basin | 2012 Stock Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance metrics weighted average         20.00%          
Approval of a Farmout Agreement in the Bonaparte Basin | 2012 Stock Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance metrics weighted average         10.00%          
Preparing Poplar of Commercially Viable CO2-EOR Development | PBOs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance metrics weighted average       40.00%            
Progressing UK Operations in the Weald Basin | PBOs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance metrics weighted average       20.00%            
Moving Forward with Farnham Dome Project | PBOs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance metrics weighted average       20.00%