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Note 7 - Fair Value Measurements - Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Reported Value Measurement [Member]    
Financial Assets:    
Cash and due from banks $ 12,066 $ 13,974
Interest-bearing deposits 58,260 80,268
Securities 439,073 439,239
Restricted securities 1,200 1,170
Loans held for sale 505 478
Loans, net 651,889 639,452
Accrued interest receivable 5,123 5,260
Bank-owned life insurance 33,520 22,998
Financial Liabilities:    
Deposits 1,031,973 1,043,442
Accrued interest payable 51 55
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial Assets:    
Cash and due from banks 12,066 13,974
Interest-bearing deposits 58,260 80,268
Securities 0 0
Restricted securities 0 0
Loans held for sale 0 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 443,182 441,974
Restricted securities 1,200 1,170
Loans held for sale 505 478
Loans, net 0 0
Accrued interest receivable 5,123 5,260
Bank-owned life insurance 33,520 22,998
Financial Liabilities:    
Deposits 913,254 912,828
Accrued interest payable 51 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
Loans held for sale 0 0
Loans, net 651,431 658,386
Accrued interest receivable 0 0
Bank-owned life insurance 0 0
Financial Liabilities:    
Deposits 117,222 128,690
Accrued interest payable $ 0 $ 0