Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 2,563	$ 98,232	$ 9,651
Adjustments to reconcile net income to net cash provided by operating activities:
(Income) loss from discontinued operations	(5,411)	496	621
Depreciation, depletion and amortization	7,083	5,596	6,457
Gain on revision of asset retirement obligations	(379)	(3,325)
Other amortization	241	417	369
Deferred taxes	14,480	(56,907)	(1,260)
Unrealized foreign exchange (gain) loss	(50)	834	(576)
Stock-based compensation	3,506	2,388	1,098
Cash settlements paid on exercised stock appreciation rights	(491)	(82)
Derivative instruments (gain) loss	446	(4,264)	1,032
Cash settlements received on matured derivative contracts, net	2,439	744	195
Bad debt (recovery) expense and other	(341)	(77)	452
Other operating (income) loss, net	58	(570)	84
Operational expenses associated with equipment and other	69	1,604	1,189
Change in operating assets and liabilities:
Trade receivables	(2,428)	(8,351)	3,195
Accounts with joint venture owners	(2,075)	2,747	(108)
Other receivables	(94)	(1,330)	(43)
Crude oil inventory	(287)	2,478	(2,350)
Prepayments and other	(1,014)	1,164	1,646
Value added tax and other receivables	275	(777)	(3,025)
Accounts payable	6,011	(3,409)	(7,297)
Foreign taxes payable	2,396	2,751
Accrued liabilities and other	4,161	(2,131)	2,050
Net cash provided by continuing operating activities	31,158	38,228	13,380
Net cash used in discontinued operating activities	(4,686)	(1,052)	(4,423)
Net cash provided by operating activities	26,472	37,176	8,957
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions			64
Proceeds from sale of crude oil and natural gas properties			250
Property and equipment expenditures	(10,348)	(14,127)	(1,813)
Net cash used in continuing investing activities	(10,348)	(14,127)	(1,499)
Net cash used in discontinued investing activities
Net cash used in investing activities	(10,348)	(14,127)	(1,499)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the issuances of common stock	256	544	39
Treasury shares	(3,911)	(58)	(20)
Borrowings			4,167
Debt repayment		(9,166)	(10,001)
Net cash used in continuing financing activities	(3,655)	(8,680)	(5,815)
Net cash used in discontinued financing activities
Net cash used in financing activities	(3,655)	(8,680)	(5,815)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	12,469	14,369	1,643
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF YEAR	46,655	32,286	30,643
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF YEAR	59,124	46,655	32,286
Supplemental disclosure of cash flow information:
Interest paid in cash		257	997
Income taxes (received) paid in cash	(674)	2,720	15,153
Income taxes paid in-kind with crude oil	7,268	9,385
Supplemental disclosure of non-cash investing and financing activities:
Property and equipment additions incurred but not paid at end of period	13,646	2,138	455
Crude oil and natural gas property additions paid with non-cash assets		4,197
Gross-up of crude oil and natural gas properties by establishment of deferred tax liability		18,613
Recognition of right-of-use operating lease assets	44,681
Recognition of right-of-use operating lease liabilities	44,656
Asset retirement obligations	595	(6,527)	$ 600
Restricted stock issued out of treasury	$ 309	$ 177