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Note 16 - Fair Value Measurements - Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Reported Value Measurement [Member]    
Financial assets:    
Cash and due from banks $ 12,926 $ 13,974
Interest-bearing deposits 51,233 80,268
Securities 458,551 439,239
Restricted securities 1,200 1,170
Mortgage loans held for sale 260 478
Loans, net 660,144 639,452
Accrued interest receivable 5,297 5,260
Bank-owned life insurance 33,756 22,998
Financial liabilities:    
Deposits 1,059,734 1,043,442
Accrued interest payable 62 55
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial assets:    
Cash and due from banks 12,926 13,974
Interest-bearing deposits 51,233 80,268
Securities 0 0
Restricted securities 0 0
Mortgage loans held for sale 0
Loans, net 0 0
Accrued interest receivable 0 0
Bank-owned life insurance 0 0
Financial liabilities:    
Deposits 0 0
Accrued interest payable 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial assets:    
Cash and due from banks 0 0
Interest-bearing deposits 0 0
Securities 461,500 441,974
Restricted securities 1,200 1,170
Mortgage loans held for sale 260 478
Loans, net 0 0
Accrued interest receivable 5,297 5,260
Bank-owned life insurance 33,756 22,998
Financial liabilities:    
Deposits 944,850 912,828
Accrued interest payable 62 55
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial assets:    
Cash and due from banks 0 0
Interest-bearing deposits 0 0
Securities 0 0
Restricted securities 0 0
Mortgage loans held for sale 0
Loans, net 656,399 658,386
Accrued interest receivable 0 0
Bank-owned life insurance 0 0
Financial liabilities:    
Deposits 113,053 128,690
Accrued interest payable $ 0 $ 0