Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Trade, allowance for credit losses	$ 90	$ 90
Property, plant and equipment, net	2,287,498	2,294,973
Construction-in-process	912,376	721,483
Operating leases right of use	19,935	19,357
Finance leases right of use	$ 5,541	$ 6,414
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	55,933,801	56,056,450
Common stock, shares outstanding (in shares)	55,933,801	56,056,450
Treasury stock, shares (in shares)	258,667	0
Senior Secured Notes [Member]
Deferred financing costs	$ 10,129	$ 11,304
Senior Unsecured Bonds [Member]
Deferred financing costs	3,223	3,659
Convertible Senior Notes [Member]
Deferred financing costs	10,832	0
Variable Interest Entity, Primary Beneficiary [Member]
Property, plant and equipment, net	2,143,613	2,159,696
Construction-in-process	505,188	366,924
Operating leases right of use	8,356	7,825
Finance leases right of use	$ 127	$ 192