Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 8,041	$ 8,799
Restricted cash	4,030	4,512
Certificates of deposit	0	245
Accounts receivable	14,414	25,580
Prepaid income taxes	0	1,562
Inventory	24,663	28,297
Parts and supplies	8,903	11,775
Prepaid expenses	3,282	1,678
Total current assets	63,333	82,448
Property, plant and equipment, at cost:
Land and mineral rights	115,853	114,722
Buildings and equipment	352,115	351,614
Mine development	93,635	84,160
Total property, plant and equipment, at cost	561,603	550,496
Less - accumulated DD&A	(252,245)	(220,780)
Total property, plant and equipment, net	309,358	329,716
Investment in Sunrise Energy	3,181	3,139
Other assets	8,258	10,324
Total assets	384,130	425,627
Current liabilities:
Current portion of bank debt, net	34,311	33,044
Current portion of PPP note	5,490	0
Accounts payable and accrued liabilities	31,409	31,800
Total current liabilities	71,210	64,844
Long-term liabilities:
Bank debt, net	97,307	140,594
PPP note	4,510	0
Deferred income taxes	2,824	4,884
Asset retirement obligations	16,177	15,694
Other	2,842	4,081
Total long-term liabilities	123,660	165,253
Total liabilities	194,870	230,097
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; 30,610 and 30,420 issued and outstanding, respectively	306	304
Additional paid-in capital	103,399	102,215
Retained earnings	81,555	89,011
Total stockholders’ equity	185,260	191,530
Total liabilities, redeemable noncontrolling interests, and stockholders’ equity	$ 384,130	$ 425,627