Consolidated Balance Sheets (Current Period Unaudited) - USD ($)		Jun. 30, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents		$ 107,727,885	$ 9,471,676
Short-term investments		20,001,196	0
Accounts receivable, net of allowance for doubtful accounts		22,651,347	18,580,840
Inventories, net		18,692,994	12,542,269
Prepaid expenses		2,782,085	3,275,992
Other current assets(1)	[1]	765,463	10,452,990
Total Current Assets		172,620,970	54,323,767
Property, plant and equipment, net		220,074,510	165,287,597
Deposits on equipment		6,134,329	3,600,931
Operating lease right of use assets		8,690,401	9,154,234
Other assets		4,340,100	3,759,058
Total Assets		411,860,310	236,125,587
CURRENT LIABILITIES:
Accounts payable		9,090,164	18,667,729
Accrued expenses(1)	[1]	8,985,593	22,132,928
Current operating lease liabilities		1,336,694	1,185,058
Total Current Liabilities		19,412,451	41,985,715
Long term debt		0	54,466,099
Long term operating lease liabilities		7,856,832	8,409,252
Total Liabilities		27,269,283	104,861,066
STOCKHOLDERS' EQUITY:
Common stock — voting, $0.001 par value, 200,000,000 shares authorized, 40,480,225 issued and 40,466,056 outstanding on June 30, 2020, and 36,162,433 issued and 36,148,264 outstanding on December 31, 2019		40,480	36,162
Additional paid-in capital		591,386,109	334,299,172
Accumulated deficit		(206,172,555)	(202,735,417)
Accumulated other comprehensive income (loss)		(406,781)	(79,170)
Treasury stock, at cost — 14,169 shares on June 30, 2020 and on December 31, 2019		(256,226)	(256,226)
Total Stockholders' Equity		384,591,027	131,264,521
Total Liabilities and Stockholders' Equity		$ 411,860,310	$ 236,125,587

[1] See Note 10 for additional information.