Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Revenues [Abstract]
Oil and gas production revenues	$ 25,850	$ 21,163
Other	43	33
Total revenue	25,893	21,196
Expenses:
Lease operating expenses	5,892	6,462
Production taxes	2,204	1,927
Depreciation, depletion, and amortization	7,635	6,509
General and administrative	2,823	2,530
Net interest	608	1,207
Amortization of deferred financing fees	348	333
Loss on derivative contracts - Realized	734	925
Loss on derivative contracts - Unrealized	945	621
Other	0	87
Net income	4,704	595
Segment Assets [Abstract]
Total segment assets	237,514		223,650
U.S.
Revenues [Abstract]
Oil and gas production revenues	25,475	20,558
Other	0	0
Total revenue	25,475	20,558
Expenses:
Lease operating expenses	5,645	5,804
Production taxes	2,204	1,927
Depreciation, depletion, and amortization	7,437	6,214
General and administrative	509	475
Net interest	138	166
Amortization of deferred financing fees	0	0
Loss on derivative contracts - Realized	0	0
Loss on derivative contracts - Unrealized	0	0
Net income	9,542	5,972
Segment Assets [Abstract]
Total segment assets	228,072		213,212
Canada
Revenues [Abstract]
Oil and gas production revenues	375	605
Other	0	0
Total revenue	375	605
Expenses:
Lease operating expenses	247	658
Production taxes	0	0
Depreciation, depletion, and amortization	136	233
General and administrative	348	155
Net interest	6	6
Amortization of deferred financing fees	0	0
Loss on derivative contracts - Realized	0	0
Loss on derivative contracts - Unrealized	0	0
Net income	(362)	(447)
Segment Assets [Abstract]
Total segment assets	1,302		1,640
Corporate
Revenues [Abstract]
Oil and gas production revenues	0	0
Other	43	33
Total revenue	43	33
Expenses:
Lease operating expenses	0	0
Production taxes	0	0
Depreciation, depletion, and amortization	62	62
General and administrative	1,966	1,900
Net interest	464	1,035
Amortization of deferred financing fees	348	333
Loss on derivative contracts - Realized	734	925
Loss on derivative contracts - Unrealized	945	621
Other		87
Net income	(4,476)	(4,930)
Segment Assets [Abstract]
Total segment assets	$ 8,140		$ 8,798