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Note 12 - Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Impaired Loans [Member] - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Impaired loans, net $ 476 $ 391
Fair Value, Inputs, Level 1 [Member]    
Impaired loans, net
Fair Value, Inputs, Level 2 [Member]    
Impaired loans, net
Fair Value, Inputs, Level 3 [Member]    
Impaired loans, net $ 476 $ 391