Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Discontinued Operations (Summary results of the Company's discontinued operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Loss from continuing operations, before tax $ (2,195) $ (2,040)
Discontinued Operations, Held-for-sale    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenue 143 649
Operating, exploration and general and administrative expenses 45 1,428
Depletion, depreciation, amortization and accretion 0 179
Interest expense and other disposal costs 301 65
Total expenses 346 1,672
Non-controlling interest (36) 12
Loss from continuing operations, before tax (239) (1,011)
Gain on disposal of discontinued operations before tax 1,069 0
Income tax expense (benefit) 0 0
Loss from discontinued operations before tax 830 (1,011)
CO2 Business | Discontinued Operations, Held-for-sale    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenue 143 649
Operating, exploration and general and administrative expenses 45 1,329
Depletion, depreciation, amortization and accretion 0 179
Interest expense and other disposal costs 301 65
Total expenses 346 1,573
Non-controlling interest (36) 12
Loss from continuing operations, before tax (239) (912)
Gain on disposal of discontinued operations before tax 0 0
Income tax expense (benefit) 0 0
Loss from discontinued operations before tax (239) (912)
Weald Basin | Discontinued Operations, Held-for-sale    
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 99
Depletion, depreciation, amortization and accretion 0 0
Interest expense and other disposal costs 0 0
Total expenses 0 99
Non-controlling interest 0 0
Loss from continuing operations, before tax 0 (99)
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 $ (99)