UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and equivalents	$ 1,921	$ 3,354
Oil price risk derivatives	1,061	1,634
Oil and gas sales receivable	625	1,143
Prepaid expenses and other	436	136
Marketable equity securities	260	251
Discontinued operations - assets of mining segment	135	318
Total current assets	4,438	6,836
Oil and gas properties under full cost method:
Unevaluated properties	4,665	5,664
Evaluated properties	91,913	97,912
Less accumulated depreciation, depletion and amortization	(80,918)	(80,144)
Net oil and gas properties	15,660	23,432
Other assets:
Property and equipment, net	2,622	2,658
Other assets	95	206
Total other assets	2,717	2,864
Total assets	22,815	33,132
Accounts payable and accrued liabilities:
Contingent ownership interests	4,011	3,108
Payable to major operator	2,976	4,159
Trade payables and accrued expenses	1,590	1,791
Accrued compensation and benefits	280	1,352
Current portion of long-term debt	$ 6,000	6,000
Discontinued operations of mining properties		204
Total current liabilities	$ 14,857	16,614
Noncurrent liabilities:
Asset retirement obligations	1,047	1,038
Other accrued liabilities	4	5
Total noncurrent liabilities	$ 1,051	$ 1,043
Commitments and contingencies (Note 8)
Shareholders' equity:
Preferred stock, par value $0.01 per share. Authorized 100,000 shares, issued and outstanding 50,000 shares of Series A Convertible Preferred Stock in 2016; liquidation preference of $2,034 as of March 31, 2016	$ 1
Common stock, $0.01 par value; unlimited shares authorized; issued and outstanding 28,233,068 shares in 2016 and 28,199,735 shares in 2015	282	$ 282
Additional paid-in capital	126,931	124,898
Accumulated deficit	(120,307)	(109,705)
Total shareholders' equity	6,907	15,475
Total liabilities and shareholders' equity	$ 22,815	$ 33,132