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Note 16 - Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Reported Value Measurement [Member]    
Financial assets:    
Cash and due from banks $ 13,974 $ 12,152
Interest-bearing deposits 80,268 130,811
Securities 439,239 388,159
Restricted securities 1,170 1,129
Mortgage loans held for sale 478 634
Loans, net 639,452 610,711
Accrued interest receivable 5,260 5,769
Bank-owned life insurance 22,998 22,401
Financial liabilities:    
Deposits 1,043,442 1,018,859
Accrued interest payable 55 56
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial assets:    
Cash and due from banks 13,974 12,152
Interest-bearing deposits 80,268 130,811
Securities 0 0
Restricted securities 0 0
Mortgage 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 441,974 394,163
Restricted securities 1,170 1,129
Mortgage loans held for sale 478 634
Loans, net 0 0
Accrued interest receivable 5,260 5,769
Bank-owned life insurance 22,998 22,401
Financial liabilities:    
Deposits 874,001 826,476
Accrued interest payable 55 56
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 0
Loans, net 658,386 621,590
Accrued interest receivable 0 0
Bank-owned life insurance 0 0
Financial liabilities:    
Deposits 166,946 193,912
Accrued interest payable $ 0 $ 0