Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
OPERATING ACTIVITIES:
Net loss	$ (10,134)	$ (1,032)
Deferred income taxes	(177)	(1,729)
Equity income – Sunrise Energy	(150)	0
Depreciation, depletion and amortization	9,531	10,307
Loss on sale of assets	57	0
Amortization of debt issuance costs	691	611
Asset retirement obligations accretion	246	363
Cash paid on asset retirement obligation reclamation	(703)	0
Stock-based compensation	55	282
Provision for loss on customer contracts	159	0
Change in current assets and liabilities:
Accounts receivable	(1,823)	781
Inventory	(1,076)	(9,373)
Parts and supplies	(1,455)	(385)
Prepaid expenses	1,647	(242)
Accounts payable and accrued liabilities	6,563	4,342
Other	163	135
Cash provided by operating activities	2,977	2,973
INVESTING ACTIVITIES:
Capital expenditures	(9,082)	(5,720)
Proceeds from sale of equipment	131	0
Cash used in investing activities	(8,951)	(5,720)
FINANCING ACTIVITIES:
Payments on bank debt	(9,188)	(9,188)
Borrowings of bank debt	17,500	7,500
Debt issuance costs	(590)	0
Taxes paid on vesting of RSUs	0	(2)
Cash provided by (used in) financing activities	7,722	(1,690)
Increase (decrease) in cash, cash equivalents, and restricted cash	1,748	(4,437)
Cash, cash equivalents, and restricted cash, beginning of period	5,829	12,071
Cash, cash equivalents, and restricted cash, end of period	7,577	7,634
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH CONSIST OF THE FOLLOWING:
Cash and cash equivalents	4,289	3,863
Restricted cash	3,288	3,771
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance	7,577	7,634
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest	2,044	2,145
SUPPLEMENTAL NON-CASH FLOW INFORMATION:
Change in capital expenditures included in accounts payable and prepaid expense	(641)	(1,872)
Change in capital expenditures included in accounts payable and prepaid expense	641	1,872
Interest Rate Swap [Member]
OPERATING ACTIVITIES:
Change in fair value of derivative	(617)	(848)
Fuel Hedge [Member]
OPERATING ACTIVITIES:
Change in fair value of derivative	$ 0	$ (239)