Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 2,546	$ 8,041
Restricted cash	3,283	4,030
Accounts receivable	13,584	14,414
Inventory	7,699	24,663
Parts and supplies	10,015	8,903
Prepaid expenses	2,112	3,282
Total current assets	39,239	63,333
Property, plant and equipment:
Land and mineral rights	115,837	115,853
Buildings and equipment	342,782	352,115
Mine development	112,575	93,635
Total property, plant and equipment	571,194	561,603
Less - accumulated depreciation, depletion and amortization	(268,370)	(252,245)
Total property, plant and equipment, net	302,824	309,358
Investment in Sunrise Energy	3,545	3,181
Other assets	8,372	8,258
Total assets	353,980	384,130
Current liabilities:
Current portion of bank debt, net	23,098	34,311
Current portion of PPP note	0	5,490
Accounts payable and accrued liabilities	41,528	31,409
Total current liabilities	64,626	71,210
Long-term liabilities:
Bank debt, net	84,667	97,307
PPP note	0	4,510
Deferred income taxes	2,850	2,824
Asset retirement obligations	14,025	16,177
Other	1,577	2,842
Total long-term liabilities	103,119	123,660
Total liabilities	167,745	194,870
Redeemable noncontrolling interests	4,000	4,000
Stockholders' equity:
Preferred stock, $.10 par value, 10,000 shares authorized; none issued	0	0
Common stock, $.01 par value, 100,000 shares authorized; 30,785 and 30,610 issued and outstanding, respectively	308	306
Additional paid-in capital	104,126	103,399
Retained earnings	77,801	81,555
Total stockholders’ equity	182,235	185,260
Total liabilities, redeemable noncontrolling interests, and stockholders’ equity	$ 353,980	$ 384,130