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Note 7 - Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Reported Value Measurement [Member]    
Financial Assets:    
Cash and due from banks $ 12,936 $ 13,974
Interest-bearing deposits 89,096 80,268
Securities 439,147 439,239
Restricted securities 1,200 1,170
Loans held for sale 491 478
Loans, net 646,362 639,452
Accrued interest receivable 5,139 5,260
Bank-owned life insurance 33,287 22,998
Financial Liabilities:    
Accrued interest payable 43 55
Deposits 1,062,357 1,043,442
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial Assets:    
Cash and due from banks 12,936 13,974
Interest-bearing deposits 89,096 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:    
Accrued interest payable 0 0
Deposits 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 443,732 441,974
Restricted securities 1,200 1,170
Loans held for sale 491 478
Loans, net 0 0
Accrued interest receivable 5,139 5,260
Bank-owned life insurance 33,287 22,998
Financial Liabilities:    
Accrued interest payable 43 55
Deposits 940,416 912,828
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 647,133 658,386
Accrued interest receivable 0 0
Bank-owned life insurance 0 0
Financial Liabilities:    
Accrued interest payable 0 0
Deposits $ 120,441 $ 128,690