Note 12 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021
Other real estate owned, gain (loss)			$ 180	$ (0)
Fair Value, Nonrecurring [Member]
Collateral dependent loans, fair value	$ 5,151		5,151		$ 7,546
Other real estate owned, fair value	7,229		7,229		281
Other real estate owned, gain (loss)	0	$ 0	0	0
Collateral dependent loans, gain (loss)		$ 0		$ 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans, fair value	0		0		0
Other real estate owned, fair value	0		0		0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans, fair value	0		0		0
Other real estate owned, fair value	0		0		0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	5,151		5,151		7,546
Other real estate owned, fair value	$ 7,229		$ 7,229		$ 281