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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 2,758 $ 3,277
Oil and gas sales receivable 742 687
Discontinued operations - assets of mining segment 114 114
Assets available for sale 653
Marketable securities 753 876
Transaction deposit 374 250
Other current assets 249 61
Total current assets 4,990 5,918
Oil and gas properties under full cost method:    
Unevaluated properties 4,664 4,664
Evaluated properties 86,383 86,313
Less accumulated depreciation, depletion and amortization (83,634) (83,362)
Net oil and gas properties 7,413 7,615
Other assets:    
Property and equipment, net 2,311 1,717
Other assets 58 66
Total other assets 2,369 1,783
Total assets 14,772 15,316
Accounts payable and accrued liabilities:    
Oil and gas payables 429 707
Related party payable 50
Accrued compensation and benefits 620 64
Commodity derivative contracts 24 161
Current portion of long-term debt 600
Total current liabilities 1,073 1,582
Noncurrent liabilities:    
Asset retirement obligations 925 913
Revolving credit facility 937 937
Warrant liability 1,010 1,200
Other liabilities 27 22
Total noncurrent liabilities 2,899 3,072
Commitments and contingencies (Note 8)
Shareholders' equity:    
Preferred stock, par value $0.01 per share. Authorized 100,000 shares, 50,000 shares of Series A Convertible Preferred Stock as of 6/30/2018; liquidation preference of $2,685 as of 6/30/2018 and $2,527 as of 12/31/2017. 1 1
Common stock, $0.01 par value; unlimited shares authorized; 13,058,491 and 11,820,057 shares issued and outstanding as of 6/30/2018 and 12/31/2017, respectively 131 118
Additional paid-in capital 138,174 136,631
Accumulated deficit (127,506) (126,088)
Total shareholders' equity 10,800 10,662
Total liabilities and shareholders' equity $ 14,772 $ 15,316