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Note 2 - Fair Value of Financial Instruments - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Securities available for sale $ 102,697 $ 96,490
Securities held to maturity 19,330 19,171
Reported Value Measurement [Member]    
Restricted investments in bank stocks 7,506 7,506
Loans, net 749,953 727,202
Accrued interest receivable 2,264 2,315
Deposits 808,192 790,452
Other borrowed funds 40,655 37,085
Subordinated debentures 8,500 8,500
Accrued interest payable 607 513
Cash and cash equivalents 35,486 40,166
Certificates of deposit in financial institutions 1,820 1,670
Securities available for sale 102,697 96,490
Securities held to maturity 18,605 18,665
Estimate of Fair Value Measurement [Member]    
Restricted investments in bank stocks
Loans, net 733,487 727,079
Accrued interest receivable 2,264 2,315
Deposits 808,124 790,916
Other borrowed funds 39,839 35,948
Subordinated debentures 6,287 5,821
Accrued interest payable 607 513
Cash and cash equivalents 35,486 40,166
Certificates of deposit in financial institutions 1,820 1,670
Securities available for sale 102,697 96,490
Securities held to maturity 19,330 19,171
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Restricted investments in bank stocks
Loans, net
Accrued interest receivable
Deposits 227,064 209,576
Other borrowed funds
Subordinated debentures
Accrued interest payable 2 4
Cash and cash equivalents 35,486 40,166
Certificates of deposit in financial institutions
Securities available for sale
Securities held to maturity
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Restricted investments in bank stocks
Loans, net
Accrued interest receivable 264 224
Deposits 581,060 581,340
Other borrowed funds 39,839 35,948
Subordinated debentures 6,287 5,821
Accrued interest payable 605 509
Cash and cash equivalents
Certificates of deposit in financial institutions 1,820 1,670
Securities available for sale 102,697 96,490
Securities held to maturity 9,977 9,541
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Restricted investments in bank stocks
Loans, net 733,487 727,079
Accrued interest receivable 2,000 2,091
Deposits
Other borrowed funds
Subordinated debentures
Accrued interest payable
Cash and cash equivalents
Certificates of deposit in financial institutions
Securities available for sale
Securities held to maturity $ 9,353 $ 9,630