Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 18,105	$ (3,754)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Deferred income taxes	1,756	26
Equity income – Sunrise Energy	(443)	(364)
Depreciation, depletion and amortization	46,875	39,973
Asset impairment	0	1,588
Gain on extinguishment of debt	0	(10,000)
Loss (gain) on sale of assets	(264)	317
Amortization of debt issuance costs	3,601	2,564
Asset retirement obligations accretion	1,010	1,504
Asset retirement obligations change in estimate	0	(3,510)
Cash paid on asset retirement obligation reclamation	(3,162)	0
Stock-based compensation	1,269	1,004
Provision for loss on customer contracts	159	0
Amortization of contract asset and contract liabilities	(19,731)	0
Change in current assets and liabilities:
Accounts receivable	(16,305)	830
Inventory	(25,863)	16,964
Parts and supplies	(6,271)	(1,112)
Prepaid expenses	(5,941)	(5,215)
Accounts payable and accrued liabilities	24,037	10,844
Deferred revenue	35,485	0
Other	719	(362)
Net cash provided by operating activities	54,169	47,974
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(54,020)	(28,050)
Proceeds from sale of equipment	655	525
Net cash used in investing activities	(53,365)	(27,525)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments on bank debt	(78,225)	(46,249)
Borrowings of bank debt	51,700	20,250
Issuance of convertible notes payable	11,000	0
Debt issuance costs	(2,097)	(418)
Distributions to redeemable noncontrolling interests	(585)	0
Taxes paid on vesting of RSUs	0	(274)
Net cash used in financing activities	(207)	(26,691)
Increase (decrease) in cash, cash equivalents, and restricted cash	597	(6,242)
Cash, cash equivalents, and restricted cash, beginning of year	5,829	12,071
Cash, cash equivalents, and restricted cash, end of year	6,426	5,829
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH:
Cash and cash equivalents	3,009	2,546
Restricted cash	3,417	3,283
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance	6,426	5,829
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest	8,123	8,720
SUPPLEMENTAL NON-CASH FLOW INFORMATION:
Change in capital expenditures included in accounts payable and prepaid expenses	3,440	8,520
Interest Rate Swap [Member]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Change in fair value of derivative	(867)	(3,026)
Fuel Hedge [Member]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Change in fair value of derivative	0	(297)
Senior Unsecured Convertible Notes [Member] | Four Board Members [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of related party convertible notes payable	$ 18,000	$ 0