Note 19 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Accumulated other comprehensive loss	$ 127,264	[1]	$ 94,106	[1]	$ 90,522	[1]	$ 103,602
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated other comprehensive loss	(266)		(659)		1,142
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated other comprehensive loss					(1,396)
AOCI Attributable to Parent [Member]
Accumulated other comprehensive loss	$ (266)	[1]	$ (659)	[1]	$ (254)	[1]	$ (87)

[1] Excludes 43 unvested restricted shares