Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
OPERATING ACTIVITIES:
Net loss	$ (3,386)	$ (2,964)	$ (13,520)	$ (3,996)
Deferred income taxes	421	397	244	(1,332)
Equity income – Sunrise Energy	(188)	(63)	(338)	(63)
Depreciation, depletion and amortization	11,164	9,715	20,695	20,022
Gain on sale of assets			(367)	0
Amortization of debt issuance costs	817	641	1,508	1,251
Asset retirement obligations accretion	250	373	496	736
Cash paid on asset retirement obligation reclamation			(1,184)	0
Stock-based compensation			108	567
Provision for loss on customer contracts			159	0
Change in operating assets and liabilities:
Accounts receivable			(3,571)	28
Inventory			(6,107)	(7,682)
Parts and supplies			(2,232)	(392)
Prepaid expenses			705	(108)
Accounts payable and accrued liabilities			4,065	5,652
Other			485	198
Cash provided by operating activities			279	12,888
INVESTING ACTIVITIES:
Capital expenditures			(22,903)	(10,837)
Proceeds from sale of equipment			758	0
Cash used in investing activities			(22,145)	(10,837)
FINANCING ACTIVITIES:
Payments on bank debt			(14,700)	(18,875)
Borrowings of bank debt			33,700	11,250
Debt issuance costs			(590)	(418)
Taxes paid on vesting of RSUs			0	(2)
Cash provided by (used in) financing activities			28,410	(8,045)
Increase (decrease) in cash, cash equivalents, and restricted cash			6,544	(5,994)
Cash, cash equivalents, and restricted cash, beginning of period			5,829	12,071
Cash, cash equivalents, and restricted cash, end of period	12,373	6,077	12,373	6,077
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH CONSIST OF THE FOLLOWING:
Cash and cash equivalents	8,882	2,582	8,882	2,582
Restricted cash	3,491	3,495	3,491	3,495
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance	$ 12,373	$ 6,077	12,373	6,077
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest			4,055	4,446
SUPPLEMENTAL NON-CASH FLOW INFORMATION:
Change in capital expenditures included in accounts payable and prepaid expense			2,004	3,613
Debt issuance costs included in accounts payable and accrued liabilities			853	0
Convertible notes payable and related party convertible notes payable converted to common stock			10,000	0
Senior Unsecured Convertible Notes [Member] | Non-affiliated Party [Member]
FINANCING ACTIVITIES:
Issuance of convertible note payable			1,000	0
Senior Unsecured Convertible Notes [Member] | Four Board Members [Member]
FINANCING ACTIVITIES:
Issuance of related party convertible notes payable			9,000	0
Interest Rate Swap [Member]
OPERATING ACTIVITIES:
Change in fair value of derivative			(867)	(1,614)
Fuel Hedge [Member]
OPERATING ACTIVITIES:
Change in fair value of derivative			$ 0	$ (379)