Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 340,967	$ 67,247
Accounts receivable, net of allowance for doubtful accounts	28,818	18,438
Inventories, net	21,825	19,119
Prepaid expenses	2,496	3,378
Other current assets	1,936	914
Total Current Assets	396,042	109,096
Property, plant and equipment, net	331,371	281,073
Deposits on equipment	3,617	3,710
Operating lease right of use assets	7,557	7,866
Equity method investment	27,658	27,894
Other assets	7,727	4,749
Total Assets	773,972	434,388
CURRENT LIABILITIES:
Accounts payable	30,955	16,452
Accrued expenses	13,570	15,371
Current operating lease liabilities	1,298	1,298
Total Current Liabilities	45,823	33,121
Long term operating lease liabilities	6,753	7,098
Total Liabilities	52,576	40,219
STOCKHOLDERS' EQUITY:
Common stock — voting, $0.001 par value, 200,000 shares authorized, 43,242 issued and 43,228 outstanding on March 31, 2021, and 40,732 issued and 40,718 outstanding on December 31, 2020	43	41
Additional paid-in capital	938,242	600,388
Accumulated deficit	(216,812)	(205,924)
Accumulated other comprehensive income (loss)	179	(80)
Treasury stock, at cost — 14 shares on March 31, 2021 and on December 31, 2020	(256)	(256)
Total Stockholders' Equity	721,396	394,169
Total Liabilities and Stockholders' Equity	$ 773,972	$ 434,388