Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property, plant and equipment, net	$ 1,526,485	$ 1,556,378
Construction-in-process	$ 408,939	$ 306,709
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)	49,910,280	49,667,340
Common stock, shares outstanding (in shares)	49,910,280	49,667,340
Senior Secured Notes [Member]
Deferred financing costs	$ 8,528	$ 9,177
Other Loans, Limited and Non-recourse [Member]
Deferred financing costs	5,957	6,409
Senior Unsecured Bonds [Member]
Deferred financing costs	654	755
Other Loans, Full Recourse [Member]
Deferred financing costs	1,206	1,346
Variable Interest Entity, Primary Beneficiary [Member]
Property, plant and equipment, net	1,449,920	1,483,224
Construction-in-process	$ 159,612	$ 120,853