Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 9,759	$ 5,532
Accounts receivable	15,801	19,256
Inventories	25,455	15,261
Prepaid expenses and other	3,160	4,274
Total current assets	54,175	44,323
Property, plant and equipment – net	183,145	178,202
Advanced coal royalties	3,832	3,271
Other	949	1,017
Total Assets	242,101	226,813
Current liabilities
Accounts payable	8,236	10,663
Accrued expenses	12,752	11,740
Deferred income	1,139
Asset retirement obligations	702	19
Current portion of long-term debt	4,914	3,333
Other	94	656
Total current liabilities	27,837	26,411
Asset retirement obligations	14,220	14,586
Long-term debt, net	15,901	9,614
Deferred tax liability	6,635	5,265
Other long-term liabilities	975	854
Total liabilities	65,568	56,730
Commitments and contingencies
Stockholders' Equity
Common stock, $0.01 par value, 260,000,000 shares authorized, 42,621,869 and 40,933,831 shares issued and outstanding, respectively	426	410
Additional paid-in capital	156,777	154,957
Retained earnings	19,330	14,716
Total stockholders' equity	176,533	170,083
Total Liabilities and Stockholders' Equity	$ 242,101	$ 226,813