Note 10 - Share-based Compensation - Summary of Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity awards	$ (4,648)	$ 2,451	$ (11,738)	$ 13,169
Liability awards		(1,153)	(20)	977
Total share-based compensation	(4,648)	1,298	(11,758)	14,146
Capitalized share-based compensation	(71)	183	(780)	(1,415)
Total share-based compensation expense	$ (4,719)	$ 1,481	$ (12,538)	$ 12,731