Note 15 - Fair Value Measurements - Impaired Loans and Other Real Estate Owned Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Impaired loans net of valuation allowance	$ 957	$ 970
Other real estate owned net of valuation allowance		1,553
Fair Value, Inputs, Level 1 [Member]
Impaired loans net of valuation allowance		0
Fair Value, Inputs, Level 2 [Member]
Impaired loans net of valuation allowance		0
Fair Value, Inputs, Level 3 [Member]
Impaired loans net of valuation allowance	$ 957	970
Other real estate owned net of valuation allowance		$ 1,553