Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Oil and gas sales	$ 51,347	$ 45,782	$ 104,099	$ 88,194
Costs and Expenses:
General and administrative, net	5,794	6,811	11,370	16,645
Depreciation, depletion, and amortization	13,096	10,828	26,228	20,543
Accretion of asset retirement obligation	84	576	243	1,140
Lease operating costs	3,760	4,776	8,721	10,549
Transportation and gas processing	5,421	4,761	10,446	9,146
Severance and other taxes	2,662	2,280	5,692	3,898
Operating Expenses	30,817	30,032	62,700	61,921
Operating Income (Loss)	20,530	15,750	41,399	26,273
Net gain (loss) on commodity derivatives	(10,752)	5,132	(17,107)	16,068
Interest expense, net	(6,585)	(4,642)	(12,474)	(8,249)
Other Nonoperating Income (Expense)	(546)	1	(703)	(141)
Income (Loss) Before Income Taxes	2,647	16,241	11,115	33,951
Provision (Benefit) for Income Taxes	328	0	328	0
Net Income (Loss)	$ 2,319	$ 16,241	$ 10,787	$ 33,951
Per Share Amounts-
Earnings Per Share, Basic	$ 0.20	$ 1.41	$ 0.93	$ 2.99
Earnings Per Share, Diluted	$ 0.20	$ 1.41	$ 0.92	$ 2.97
Weighted Average Shares Outstanding - Basic	11,655	11,487	11,629	11,360
Weighted Average Shares Outstanding - Diluted	11,757	11,554	11,742	11,445