UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (740)	$ (10,602)
Loss from discontinued operations		2,327
Loss from continuing operations	(740)	(8,275)
Adjustments to reconcile loss from continuing operations to net cash used in operating activities:
Depreciation, depletion and amortization	304	818
Impairment of oil and gas properties		6,957
Change in fair value of oil price risk derivative		573
Stock-based compensation and services	106	34
Warrant fair value adjustment	(340)
Other	28	105
Decrease (increase) in:
Oil and gas sales receivable	(96)	517
Other assets	(140)	(298)
Increase (decrease) in:
Accounts payable and accrued liabilities	533	(465)
Accrued compensation and benefits	12	(1,072)
Net cash used in operating activities	(333)	(1,106)
Cash flows from investing activities:
Capital expenditures	(21)	(1)
Net cash used in investing activities:	(21)	(1)
Cash flows from financing activities:
Proceeds from issuance of preferred stock		1
Net cash provided by financing activities		1
Discontinued operations:
Net cash used in operating activities		(327)
Net cash used in discontinued operations		(327)
Net decrease in cash and equivalents	(354)	(1,433)
Cash and equivalents, beginning of year	2,518	3,354
Cash and equivalents, end of year	2,164	1,921
Non-cash investing and financing activities:
Issuance of preferred stock in disposition of mining segment		$ 2,000