Note 12 - Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Income (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net gain (loss)		$ (2,894)	$ 515	$ (6,996)	$ 2,907
Not Designated as Hedging Instrument [Member]
Net gain (loss)	[1]	(1,632)	668	(4,279)	2,382
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Net gain (loss)	[2]	$ (1,262)	$ (153)	$ (2,717)	$ 525

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

[2] Net gains and losses recorded during the three and nine months ended September 30, 2019, are recorded as part of "Interests and fees on loans" in the Consolidated Statements of Income. Net gains and losses recorded during the three and nine months ended September 30, 2018, are recorded as part of "Net gain/loss from fair value adjustments" in the Consolidated Statements of Income.