Note 14 - Financial Derivatives - Fair Value Swap Hedges (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net unrealized loss		$ 3,614	$ (3,478)	$ (3,171)
Periodic net settlement of SWAPs	[1]	(9,345)	(7,719)
Interest Rate Swap [Member]
Derivative, Notional Amount		324,800
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Derivative, Notional Amount		$ 729,280	$ 478,266
Weighted average fixed rate-pay		2.65%	4.56%
Weighted average variable rate-receive		1.43%	3.11%
Net unrealized loss	[2]	$ (1,013)	$ (15,082)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | London Interbank Offered Rate (LIBOR) [Member]
Weighted average variable rate spread		1.31%	2.46%

[1] the amount of periodic net settlement of interest rate swaps was included in interest income.

[2] the amount is included in other non-interest income.