Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 19,394	$ 5,300
Accounts receivable	13,882	20,299
Inventories	19,575	11,947
Prepaid expenses and other	4,912	4,953
Total current assets	57,763	42,499
Property, plant and equipment - net	177,575	180,455
Financeing lease right-of-use assets	5,750
Advanced coal royalties	5,421	4,784
Other	573	885
Total Assets	247,082	228,623
Current liabilities
Accounts payable	16,847	11,742
Accrued expenses	12,946	11,591
Asset retirement obligations	334	46
Current portion of long-term debt	4,931	4,872
Current portion of financing lease obligations	1,748
Other current liabilities	111	862
Total current liabilities	36,917	29,113
Asset retirement obligations	15,201	15,110
Long-term debt, net	3,125	12,578
Long-term financing lease obligations, net	3,584
Deferred tax liability	1,824	1,762
Other long-term liabilities	1,001	965
Total liabilities	61,652	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	441	427
Additional paid-in capital	161,095	158,859
Retained earnings	23,894	9,809
Total stockholders' equity	185,430	169,095
Total Liabilities and Stockholders' Equity	$ 247,082	$ 228,623