Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 3,863	$ 8,041
Restricted cash	3,771	4,030
Accounts receivable	13,633	14,414
Inventory	34,036	24,663
Parts and supplies	9,288	8,903
Prepaid expenses	1,631	3,282
Total current assets	66,222	63,333
Property, plant and equipment, at cost:
Land and mineral rights	115,840	115,853
Buildings and equipment	356,256	352,115
Mine development	96,971	93,635
Total property, plant and equipment, at cost	569,067	561,603
Less - accumulated depreciation, depletion and amortization	(262,523)	(252,245)
Total property, plant and equipment, net	306,544	309,358
Investment in Sunrise Energy	3,181	3,181
Other assets	8,261	8,258
Total Assets	384,208	384,130
Current liabilities:
Current portion of bank debt, net	34,311	34,311
Current portion of PPP note	8,871	5,490
Accounts payable and accrued liabilities	35,166	31,409
Total current liabilities	78,348	71,210
Long-term liabilities:
Bank debt, net	96,230	97,307
PPP note	1,129	4,510
Deferred income taxes	1,095	2,824
Asset retirement obligations	16,537	16,177
Other	2,361	2,842
Total long-term liabilities	117,352	123,660
Total liabilities	195,700	194,870
Redeemable noncontrolling interests	4,000	4,000
Stockholders' equity:
Preferred stock, $.10 par value, 10,000 shares authorized; none issued and outstanding	0	0
Common stock, $.01 par value, 100,000 shares authorized; 30,613 and 30,610 issued and outstanding, respectively	306	306
Additional paid-in capital	103,679	103,399
Retained earnings	80,523	81,555
Total stockholders’ equity	184,508	185,260
Total liabilities, redeemable noncontrolling interests, and stockholders’ equity	$ 384,208	$ 384,130