Note 23 - Derivatives and Risk Management Activities - Derivative Instrument Gain (Loss) Recorded in Statement of Income (Details) - Mortgage Banking Income [Member] - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Best Efforts Forward Loan sales Commitments [Member] | Liability Derivatives [Member]
Derivative Gain (Loss), Net	$ 516	$ (479)	$ 5
Mandatory Forward Loan Sales Commitments [Member] | Liability Derivatives [Member]
Derivative Gain (Loss), Net	756	(717)	147
Asset Derivatives [Member] | Best Efforts Forward Loan sales Commitments [Member]
Derivative Gain (Loss), Net	3	(2)	(1)
Asset Derivatives [Member] | Mandatory Forward Loan Sales Commitments [Member]
Derivative Gain (Loss), Net	5	(2)	(8)
Interest Rate Lock Commitments [Member] | Liability Derivatives [Member]
Derivative Gain (Loss), Net	0	0	0
Interest Rate Lock Commitments [Member] | Asset Derivatives [Member]
Derivative Gain (Loss), Net	$ (1,202)	$ 1,218	$ (48)