Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
OPERATING ACTIVITIES:
Net income (loss)	$ (3,406)	$ 3,656
Deferred income taxes	(2,270)	306
Equity (income) loss – Sunrise Energy	(1,286)	166
DD&A	20,844	23,834
Gain on sale of assets	0	(100)
Unrealized gain on marketable securities	(14)	(348)
Gain on sale of royalty interests in oil properties	0	(2,949)
Amortization and write off of deferred financing costs	1,076	1,085
Accretion of ARO	676	623
Stock-based compensation	636	1,012
Change in current assets and liabilities:
Accounts receivable	12,094	(1,811)
Inventory	(13,715)	(10,416)
Parts and supplies	2,207	(1,889)
Prepaid income taxes	586	1,418
Prepaid expenses	(1,004)	7,267
Accounts payable and accrued liabilities	(6,035)	8,386
Other	3,896	(9,385)
Cash provided by operating activities	17,174	23,711
INVESTING ACTIVITIES:
Distribution from investment in Sunrise Energy	1,012	0
Capital expenditures	(10,032)	(18,293)
Proceeds from sale of equipment	56	129
Proceeds from sale of royalty interests in oil properties	0	2,949
Proceeds from sale of marketable securities	2,310	0
Proceeds from maturities of certificates of deposit	245	245
Cash used in investing activities	(6,409)	(14,970)
FINANCING ACTIVITIES:
Payments on bank debt	(26,287)	(27,363)
Borrowings of bank debt	7,250	12,000
Proceeds from PPP loan	10,000	0
Debt issuance costs	(1,903)	0
Taxes paid on vesting of RSUs	(17)	(7)
Dividends	(1,236)	(2,483)
Cash used in financing activities	(12,193)	(17,853)
Decrease in cash, cash equivalents, and restricted cash	(1,428)	(9,112)
Cash, cash equivalents, and restricted cash, beginning of period	13,311	20,094
Cash, cash equivalents, and restricted cash, end of period	11,883	10,982
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH CONSIST OF THE FOLLOWING:
Cash and cash equivalents	7,375	6,406
Restricted cash	4,508	4,576
Cash, cash equivalents, and restricted cash, end of period	11,883	10,982
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest	5,571	6,089
Cash received from income taxes	1,111	1,569
SUPPLEMENTAL NON-CASH FLOW INFORMATION:
Capital expenditures included in accounts payable and prepaid expense	1,527	5,544
Right-of-use assets acquired by operating lease	0	942
Interest Rate Swap [Member]
OPERATING ACTIVITIES:
Change in fair value of derivative	1,976	2,856
Fuel Hedge [Member]
OPERATING ACTIVITIES:
Change in fair value of derivative	$ 913	$ 0