Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Other	$ 21	$ 12	$ 26	$ 49
Revenues	31,536	41,625	100,870	113,171
Operating costs and expenses:
Lease operating	5,647	6,724	21,447	17,023
Production and ad valorem taxes	2,495	3,569	8,519	9,167
Rig expense			672
Depreciation, depletion, amortization and accretion	12,605	11,142	38,367	30,241
General and administrative (including stock-based compensation of $504; $428; $1,398 and $1,894, respectively)	2,736	2,586	8,169	8,379
Total operating cost and expenses	23,483	24,021	77,174	64,810
Operating income	8,053	17,604	23,696	48,361
Other (income) expense:
Interest income	(27)		(50)	(1)
Interest expense	2,951	1,952	8,706	4,644
Amortization of deferred financing fees	169	113	418	320
(Gain) 1oss on derivative contracts	(12,081)	13,568	11,358	41,215
Loss on sale of non-oil and gas assets		194		181
Total other (income) expense	(8,988)	15,827	20,432	46,359
Income before income tax	17,041	1,777	3,264	2,002
Income tax (expense) benefit	0	0	0	0
Net income	$ 17,041	$ 1,777	$ 3,264	$ 2,002
Net income per common share - basic (in dollars per share)	$ 0.10	$ 0.01	$ 0.02	$ 0.01
Net income per common share - diluted (in dollars per share)	$ 0.10	$ 0.01	$ 0.02	$ 0.01
Weighted average shares outstanding:
Basic (in shares)	166,572	165,392	166,046	165,083
Diluted (in shares)	169,599	167,629	166,493	167,865
Oil Revenues [Member]
Revenues:
Revenues	$ 31,228	$ 37,039	$ 97,355	$ 100,505
Gas Revenues [Member]
Revenues:
Revenues	226	1,897	2,107	5,882
Natural Gas Liquids Revenues [Member]
Revenues:
Revenues	$ 61	$ 2,677	$ 1,382	$ 6,735