Quarterly report pursuant to Section 13 or 15(d)

Discontinued Operations (Summary results of the Company's discontinued operations) (Details)

v3.6.0.2
Discontinued Operations (Summary results of the Company's discontinued operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loss from continuing operations, before tax $ (531) $ (1,007) $ (2,726) $ (3,046)
Discontinued Operations, Held-for-sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenue 143 1,215    
Operating, exploration and general and administrative expenses 41 2,112    
Depletion, depreciation, amortization and accretion 0 404    
Interest expense and other disposal costs 301 97    
Total expenses 342 2,613    
Non-controlling interest (36) 25    
Loss from continuing operations, before tax (235) (1,373)    
Gain on disposal of discontinued operations before tax 1,069 0    
Income tax expense (benefit) 0 0    
Loss from discontinued operations before tax 834 (1,373)    
Discontinued Operations, Held-for-sale | CO2 Business        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenue 143 1,215    
Operating, exploration and general and administrative expenses 41 1,999    
Depletion, depreciation, amortization and accretion 0 404    
Interest expense and other disposal costs 301 97    
Total expenses 342 2,500    
Non-controlling interest (36) 25    
Loss from continuing operations, before tax (235) (1,260)    
Gain on disposal of discontinued operations before tax 0 0    
Income tax expense (benefit) 0 0    
Loss from discontinued operations before tax (235) (1,260)    
Discontinued Operations, Held-for-sale | Weald Basin        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenue 0 0    
Operating, exploration and general and administrative expenses 0 113    
Depletion, depreciation, amortization and accretion 0 0    
Interest expense and other disposal costs 0 0    
Total expenses 0 113    
Non-controlling interest 0 0    
Loss from continuing operations, before tax 0 (113)    
Gain on disposal of discontinued operations before tax 1,069 0    
Income tax expense (benefit) 0 0    
Loss from discontinued operations before tax $ 1,069 $ (113)