CONDOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
OPERATING ACTIVITIES FROM CONTINUING OPERATIONS:
Net loss	$ (19,785,000)	$ (29,510,000)
Loss from discontinued operations	0	(471,000)
Net loss from continuing operations	(19,785,000)	(29,039,000)
Adjustments to reconcile net loss from continuing operations to net cash flow from operating activities:
Depreciation	13,471,000	13,602,000
Change in fair value of warrant asset	477,000	0
Impairment of long-lived assets	169,000	4,000,000
Impairment of equity securities	869,000	0
Amortization of debt issuance costs	974,000	2,611,000
Loss on debt extinguishment	0	591,000
Stock-based compensation expense	2,182,000	2,344,000
Remeasurement of environmental liability	453,000	2,409,000
Professional fees paid in common stock	0	250,000
Loss (gain) on sale of assets	641,000	(9,903,000)
Revenues from digital assets production	(19,061,000)	0
Proceeds from sale of digital assets	11,149,000	0
Gain on digital assets	(2,154,000)	0
Changes in operating assets and liabilities:
Accounts receivable	(1,135,000)	2,338,000
Digital Assets	0	1,000
Emissions and carbon offset credits	(1,430,000)	(4,434,000)
Prepaid expenses and other assets	770,000	2,829,000
Accounts payable	1,060,000	(2,748,000)
Accrued emissions expense	(1,852,000)	4,468,000
Accrued expenses	(1,846,000)	(3,407,000)
Income tax receivable	857,000	(59,000)
Contract liabilities	2,339,000	0
Other long-term liabilities	0	2,543,000
Other	(192,000)	(551,000)
Net cash flow used for operating activities from continuing operations	(12,044,000)	(12,155,000)
INVESTING ACTIVITIES FROM CONTINUING OPERATIONS:
Purchases of and deposits for property and equipment	(10,422,000)	(13,015,000)
Proceeds from sale of digital assets	3,485,000	0
Proceeds from sales of assets	3,049,000	6,984,000
Net cash flow used for investing activities from continuing operations	(3,888,000)	(6,031,000)
FINANCING ACTIVITIES FROM CONTINUING OPERATIONS:
Proceeds from issuance of common stock, net of issuance costs	5,239,000	20,581,000
Proceeds from issuance of common stock and pre-funded warrants	6,000,000	0
Principal payments on debt	0	(6,809,000)
Net cash flow provided by financing activities from continuing operations	11,239,000	13,772,000
Discontinued Operations:
Net cash flow from operating activities of discontinued operations	0	(816,000)
Net cash flow from investing activities of discontinued operations	0	3,325,000
Increase in cash and cash equivalents from discontinued operations	0	2,509,000
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(4,693,000)	(1,905,000)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - beginning of year	13,312,000	15,217,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - end of year	$ 8,619,000	$ 13,312,000