Note 15 - Financial Derivatives - Cash Flow Swap Hedges (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Unrealized loss, net of taxes		$ 492	$ 532	$ 2,194	$ (3,981)
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Notional		$ 119,136		$ 119,136		$ 119,136
Weighted average fixed rate-pay		2.61%		2.61%		2.61%
Weighted average variable rate-receive		0.15%		0.15%		0.44%
Unrealized loss, net of taxes	[1]			$ (4,696)		$ (6,890)
Periodic net settlement of swaps	[2]	$ 754	$ 702	$ 2,196	$ 1,471

[1] Included in other comprehensive income.

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