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Note 7 - Fair Value Measurements - Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Reported Value Measurement [Member]    
Financial Assets:    
Cash and due from banks $ 10,598 $ (12,926)
Interest-bearing deposits 76,571 51,233
Securities 460,116 458,551
Restricted securities 1,221 1,200
Loans, net 651,272 660,144
Accrued interest receivable 5,360 5,297
Bank-owned life insurance 33,984 33,756
Cash and due from banks (10,598) 12,926
Loans held for sale   260
Financial Liabilities:    
Deposits 1,072,940 1,059,734
Accrued interest payable 55 62
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial Assets:    
Cash and due from banks 10,598 (12,926)
Interest-bearing deposits 76,571 51,233
Securities 0 0
Restricted securities 0 0
Loans, net 0 0
Accrued interest receivable 0 0
Bank-owned life insurance 0 0
Cash and due from banks (10,598) 12,926
Loans held for sale   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 461,760 461,500
Restricted securities 1,221 1,200
Loans, net 0 0
Accrued interest receivable 5,360 5,297
Bank-owned life insurance 33,984 33,756
Cash and due from banks 0 0
Loans held for sale   260
Financial Liabilities:    
Deposits 961,305 944,850
Accrued interest payable 55 62
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, net 648,273 656,399
Accrued interest receivable 0 0
Bank-owned life insurance 0 0
Cash and due from banks 0 0
Loans held for sale   0
Financial Liabilities:    
Deposits 111,627 113,053
Accrued interest payable $ 0 $ 0