Note 16 - Financial Derivatives - Cash Flow Swap Hedges (Details) - USD ($)		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net gain/(loss) (1)		$ (1,763,000)	$ 5,813,000	$ 3,614,000
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Notional		$ 1,156,007,000	$ 874,034,000
Weighted average fixed rate-pay		2.01%	2.12%
Weighted average variable rate spread		0.32%	0.68%
Weighted average variable rate-received		5.41%	2.61%
Net gain/(loss) (1)		$ 7,935	$ 38,589
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Notional		38,600,000	50,000,000
Periodic net settlement of swaps	[1]	$ 29,514,000	$ 3,107,000

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