Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Collateral dependent loans, fair value	$ 0	$ 0
Collateral dependent loans	0	0
Other real estate owned, fair value	0	0
Other real estate owned, gain (loss)	0	0
Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans, fair value	0	0
Other real estate owned, fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans, fair value	14,785	4,487
Other real estate owned, fair value	7,156	7,212
Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	14,785	4,487
Other real estate owned, fair value	$ 7,156	$ 7,212