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Note 6 - Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Other Real Estate Owned [Member]    
Assets, Fair Value $ 1,578 $ 1,848
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value 0 0
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value 0 0
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value 1,578 1,848
Impaired Loans [Member]    
Assets, Fair Value 1,454 1,454
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value 0 0
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value 0 0
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value $ 1,454 $ 1,454