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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and equivalents $ 3,277 $ 2,518
Oil and gas sales receivable 687 562
Discontinued operations - assets of mining segment 114 114
Assets available for sale 653 653
Marketable securities 876 947
Refundable deposits 250
Other current assets 61 95
Total current assets 5,918 4,889
Oil and gas properties under full cost method:    
Unevaluated properties and exploratory wells in progress 4,664 4,664
Evaluated properties 86,313 87,834
Less accumulated depreciation, depletion and amortization (83,362) (82,640)
Net oil and gas properties 7,615 9,858
Other assets:    
Property and equipment, net 1,717 1,864
Other assets 66 156
Total other assets 1,783 2,020
Total assets 15,316 16,767
Accounts payable and accrued liabilities:    
Payable to major operator 2,710
Contingent ownership interests 1,430
Other 707 743
Related party payable 50
Accrued compensation and benefits 64 49
Current portion of long-term debt 600 6,000
Liabilities from derivative contracts 161
Total current liabilities 1,582 10,932
Noncurrent liabilities:    
Long-term debt, less current portion 937
Asset retirement obligations 913 1,045
Warrant liability 1,200 1,030
Other liabilities 22 2
Total noncurrent liabilities 3,072 2,077
Commitments, contingencies, and related party transactions (Note 10)
Shareholders' equity:    
Preferred stock, par value $0.01 per share. Authorized 100,000 shares, 50,000 shares of series A Convertible Preferred Stock in 2017; liquidation preference of $2,527 as of December 31, 2017 1 1
Common stock, $0.01 par value; unlimited shares authorized; 11,820,057 and 6,134,506 shares issued and outstanding, respectively 118 61
Additional paid-in capital 136,631 127,576
Accumulated deficit (125,185) (123,825)
Other comprehensive loss (903) (55)
Total shareholders' equity 10,662 3,758
Total liabilities and shareholders' equity $ 15,316 $ 16,767