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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 2,993 $ 3,277
Oil and gas sales receivable 927 687
Discontinued operations - assets of mining segment 114
Assets available for sale 653
Marketable securities 956 876
Transaction deposit 374 250
Other current assets 154 61
Total current assets 5,404 5,918
Oil and gas properties under full cost method:    
Unevaluated properties 4,753 4,664
Evaluated properties 86,432 86,313
Less accumulated depreciation, depletion and amortization (83,707) (83,362)
Net oil and gas properties 7,478 7,615
Other assets:    
Property and equipment, net 2,280 1,717
Other assets 80 66
Total other assets 2,360 1,783
Total assets 15,242 15,316
Accounts payable and accrued liabilities:    
Oil and gas payables 390 707
Related party payable 50
Accrued compensation and benefits 401 64
Commodity derivative contracts 37 161
Credit Facility 937 600
Total current liabilities 1,765 1,582
Noncurrent liabilities:    
Asset retirement obligations 932 913
Credit Facility 937
Warrant liability 722 1,200
Other liabilities 26 22
Total noncurrent liabilities 1,680 3,072
Commitments and contingencies (Note 8)
Preferred stock: Authorized 100,000 shares, 50,000 shares of Series A Convertible (par value $0.01) issued and outstanding as of September 30, 2018 and December 31, 2017; liquidation preference of $2,769 and $2,527 as of September 30, 2018 and December 31, 2017, respectively. 2,000 2,000
Shareholders' equity:    
Common stock, $0.01 par value; unlimited shares authorized; 13,405,838 and 11,820,057 shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively 134 118
Additional paid-in capital 136,701 134,632
Accumulated deficit (127,038) (126,088)
Total shareholders' equity 9,797 8,662
Total liabilities, preferred stock and shareholders' equity $ 15,242 $ 15,316