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	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Other real estate owned, gain (loss)		$ 47	$ (0)
Fair Value, Nonrecurring [Member]
Collateral dependent loans, fair value		12,416
Other real estate owned, fair value		648		$ 281
Other real estate owned, gain (loss)	$ 0	0	0
Impaired loans				7,546
Impaired loans, losses recorded	$ 0		$ 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans, fair value		0
Other real estate owned, fair value		0		0
Impaired loans				0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans, fair value		0
Other real estate owned, fair value		0		0
Impaired loans				0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value		12,416
Other real estate owned, fair value		$ 648		281
Impaired loans				$ 7,546