Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 1,635	$ 2,842
Restricted cash	4,737	4,281
Accounts receivable	14,228	19,937
Inventory	29,688	23,075
Parts and supplies	40,360	38,877
Prepaid expenses	2,614	2,262
Total current assets	93,262	91,274
Property, plant and equipment:
Land and mineral rights	115,486	115,486
Buildings and Equipment, Gross	537,921	537,131
Mine development	161,669	158,642
Finance lease right-of-use assets	16,178	12,346
Total property, plant and equipment	831,254	823,605
Less - accumulated depreciation, depletion and amortization	(348,783)	(334,971)
Total property, plant and equipment, net	482,471	488,634
Investment in Sunrise Energy	2,562	2,811
Other assets	7,125	7,061
Total assets	585,420	589,780
Current liabilities:
Current portion of bank debt, net	24,438	24,438
Accounts payable and accrued liabilities	47,125	62,908
Current portion of lease financing	4,958	3,933
Deferred revenue	41,242	23,062
Contract liability - power purchase agreement and capacity payment reduction	41,662	43,254
Total current liabilities	164,425	157,595
Long-term liabilities:
Bank debt, net	49,343	63,453
Convertible notes payable	10,000	10,000
Convertible notes payable - related party	1,000	9,000
Long-term lease financing	9,701	8,157
Deferred revenue	5,434	0
Deferred income taxes	8,625	9,235
Asset retirement obligations	14,934	14,538
Contract liability - power purchase agreement	36,229	47,425
Other	1,871	1,789
Total long-term liabilities	137,137	163,597
Total liabilities	301,562	321,192
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.10 par value, 10,000 shares authorized; none issued	0	0
Common stock, $.01 par value, 100,000 shares authorized; 36,534 and 34,052 issued and outstanding, as of March 31, 2024 and December 31, 2023, respectively	365	341
Additional paid-in capital	144,490	127,548
Retained earnings	139,003	140,699
Total stockholders’ equity	283,858	268,588
Total liabilities and stockholders’ equity	585,420	589,780
Related Party [Member]
Current liabilities:
Notes payable - related party	$ 5,000	$ 0