Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 5,544	$ 5,300
Accounts receivable	21,743	20,299
Inventories	24,190	11,947
Prepaid expenses and other	5,833	4,953
Total current assets	57,310	42,499
Property, plant and equipment – net	177,736	180,455
Advanced coal royalties	5,397	4,784
Other	540	885
Total Assets	240,983	228,623
Current liabilities
Accounts payable	16,751	11,742
Accrued expenses	10,721	11,591
Asset retirement obligations	395	46
Current portion of long-term debt	4,902	4,872
Other current liabilities	485	862
Total current liabilities	33,254	29,113
Asset retirement obligations	14,873	15,110
Long-term debt, net	15,954	12,578
Deferred tax liability	1,596	1,762
Other long-term liabilities	1,013	965
Total liabilities	66,690	59,528
Commitments and contingencies
Stockholders' Equity
Common stock, $0.01 par value, 260,000,000 shares authorized, 44,229,961 and 42,706,908 shares issued and outstanding, respectively	442	427
Additional paid-in capital	159,899	158,859
Retained earnings	13,952	9,809
Total stockholders' equity	174,293	169,095
Total Liabilities and Stockholders' Equity	$ 240,983	$ 228,623