Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Oil and gas sales	$ 87,099,000	$ 108,287,000	$ 66,667,000
Expenses:
Lease operating expenses	20,552,000	33,162,000	28,508,000
Production taxes	3,198,000	3,302,000	354,000
Depreciation, depletion and amortization	22,667,000	32,053,000	28,720,000
Ceiling test write-down	0	0	40,304,000
General and administrative	17,564,000	15,860,000	26,040,000
Accretion of asset retirement obligation	322,000	2,252,000	2,515,000
Interest expense	28,147,000	28,836,000	30,019,000
Total expenses	92,450,000	115,465,000	156,460,000
Other income (expense):
Other income (expense)	248,000	(408,000)	(560,000)
Other income (expense), net	248,000	(408,000)	(560,000)
Loss from operations	(5,103,000)	(7,586,000)	(90,353,000)
Reorganization items	4,293,000	0	0
Income tax expense (benefit)	152,000	(949,000)	543,000
Net loss	(9,548,000)	(6,637,000)	(90,896,000)
Preferred stock dividend	4,371,000	5,139,000	5,349,000
Net loss available to common stockholders	$ (13,919,000)	$ (11,776,000)	$ (96,245,000)
Basic
Net loss per share (in usd per share)	$ (0.54)	$ (0.55)	$ (5.24)
Diluted
Net loss per share (in usd per share)	$ (0.54)	$ (0.55)	$ (5.24)
Weighted average number of common shares:
Basic (shares)	25,581	21,330	18,354
Diluted (shares)	25,581	21,330	18,354