Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ 5,372	$ (7,877)
Items not involving cash:
Depreciation, depletion and amortization	1,234	938
Accretion of asset retirement obligations	155	70
Impairment of oil and gas properties		4,299
Unrealized commodity derivative (gain) loss	(3,023)	966
Warrant derivative unrealized (gain)	(1,683)
Stock-based compensation expense	539	663
Investment in affiliates (gain) loss		6
Other	(72)	(7)
Net change in:
Accounts receivable	1,331	341
Prepaid expenses, deposits and other current assets	(375)	22
Accounts payable, accrued liabilities and firm transportation contract obligations	(1,142)	(56)
Net cash provided by (used in) operating activities	2,336	(635)
Cash flows from investing activities:
Development and acquisition of properties and equipment	(1,182)	(233)
Proceeds from sale of oil and gas properties and other assets		8
Other long-term assets	(15)	49
Investment in affiliates	(240)	275
Net cash provided by (used in) investing activities	(1,437)	99
Cash flows from financing activities:
Proceeds from notes payable	600	700
Payments on notes payable	(1,300)	(200)
Distributions to non-controlling interests	(43)	(3)
Net cash (used in) provided by financing activities	(743)	497
Net increase (decrease) in cash and cash equivalents	156	(39)
Cash and cash equivalents, beginning of period	858	305
Cash and cash equivalents, end of period	$ 1,014	$ 266