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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and equivalents $ 2,340 $ 3,277
Oil and natural gas sales receivable 697 687
Related party receivable 2
Discontinued operations - assets of mining segment 114
Assets available for sale 653
Marketable equity securities 536 876
Refundable deposits 250
Other current assets 113 61
Total current assets 3,688 5,918
Oil and natural gas properties under full cost method:    
Unevaluated properties 3,728 4,664
Evaluated properties 88,764 86,313
Less accumulated depreciation, depletion and amortization (83,729) (83,362)
Net oil and natural gas properties 8,763 7,615
Other assets:    
Property and equipment, net 2,249 1,717
Other assets 78 66
Total other assets 2,327 1,783
Total assets 14,778 15,316
Current liabilities:    
Accounts payable and accrued liabilities 670 707
Related party payable 50
Accrued compensation and benefits 63 65
Current portion of credit facility 937 600
Liabilities from derivative contracts 161
Total current liabilities 1,670 1,583
Noncurrent liabilities:    
Credit facility 937
Asset retirement obligations 939 913
Warrant Liability 425 1,200
Other liabilities 25 22
Total noncurrent liabilities 1,389 3,072
Commitments and contingencies (Note 11)
Preferred stock: Authorized 100,000 shares, 50,000 shares of Series A Convertible (par value $0.01) issued and outstanding; liquidation preference of $2,856 and $2,527 as of December 31, 2018 and 2017, respectively 2,000 2,000
Shareholders' equity:    
Common stock, $0.01 par value; unlimited shares authorized; 13,405,838 and 11,802,768 shares issued and outstanding, respectively 134 118
Additional paid-in capital 136,714 134,632
Accumulated deficit (127,129) (125,186)
Accumulated other comprehensive loss (903)
Total shareholders' equity 9,719 8,661
Total liabilities, preferred stock and shareholders' equity $ 14,778 $ 15,316