Note 15 - Financial Derivatives - Fair Value Swap Hedges (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Net unrealized gain (1)		$ 3,054	$ 1,263
Periodic net settlement of SWAPs	[1]	(1,762)	$ (2,387)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Derivative, Notional Amount		$ 666,446		$ 729,280
Weighted average fixed rate-pay		2.18%		2.65%
Weighted average variable rate-receive		1.22%		1.43%
Net unrealized gain (1)	[2]	$ 15,387		$ (1,013)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | London Interbank Offered Rate (LIBOR) [Member]
Weighted average variable rate spread		1.02%		1.31%

[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.