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Note 7 - Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Reported Value Measurement [Member]    
Financial Assets:    
Cash and due from banks $ 13,654 $ 13,974
Interest-bearing deposits 85,552 80,268
Securities 437,972 439,239
Restricted securities 1,200 1,170
Loans held for sale 608 478
Loans, net 644,052 639,452
Accrued interest receivable 5,267 5,260
Bank-owned life insurance 23,141 22,998
Financial Liabilities:    
Deposits 1,046,480 1,043,442
Accrued interest payable 45 55
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial Assets:    
Cash and due from banks 13,654 13,974
Interest-bearing deposits 85,552 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 441,510 441,974
Restricted securities 1,200 1,170
Loans held for sale 608 478
Loans, net 0 0
Accrued interest receivable 5,267 5,260
Bank-owned life insurance 23,141 22,998
Financial Liabilities:    
Deposits 883,364 874,001
Accrued interest payable 45 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 650,209 658,386
Accrued interest receivable 0 0
Bank-owned life insurance 0 0
Financial Liabilities:    
Deposits 160,473 166,946
Accrued interest payable $ 0 $ 0