Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Variable Interest Entity, Primary Beneficiary [Member]
Property, plant and equipment, net	$ 1,506,927	$ 1,481,258
Construction-in-process	68,261	129,165
Senior Secured Notes [Member]
Deferred financing costs	10,265	10,852
Other Loans, Limited and Non-recourse [Member]
Deferred financing costs	6,937	7,492
Senior Unsecured Bonds [Member]
Deferred financing costs	195	283
Other Loans, Full Recourse [Member]
Deferred financing costs	348	435
Property, plant and equipment, net	1,562,315	1,559,335
Construction-in-process	$ 241,199	$ 248,835
Senior unsecured bonds %	7.00%	7.00%
Senior unsecured bonds unamortized premium	$ 359	$ 513
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)	49,566,867	49,107,901
Common stock, shares outstanding (in shares)	49,566,867	49,107,901