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Note 9 - Fair Value Measurements and Disclosures - Assets Measured at Fair Value on Non-Recurring Basis of Impairment Loans (Details) - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Impaired Loans $ 2,057 $ 3,311
Fair Value, Inputs, Level 1 [Member]    
Impaired Loans
Fair Value, Inputs, Level 2 [Member]    
Impaired Loans
Fair Value, Inputs, Level 3 [Member]    
Impaired Loans $ 2,057 $ 3,311