Note 12 - Effect of Derivative Instruments on Consolidated Statements of Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Net gain (loss)		$ (1,319)	$ (2,125)	$ (3,421)	$ 871
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Net gain (loss)		(375)	(8)	(415)	(46)
Net gain (loss)	[1]	$ (1,694)	$ (2,133)	$ (3,836)	$ 825

[1] Net gains and losses are recorded as part of "Net gain/loss from fair value adjustments" in the Consolidated Statements of Income.