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Note 2 - Fair Value of Financial Instruments - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Securities held to maturity $ 17,752 $ 18,079
Reported Value Measurement [Member]    
Cash and cash equivalents 63,191 74,573
Certificates of deposit in financial institutions 1,820 1,820
Securities available for sale 100,165 101,125
Securities held to maturity 17,313 17,581
Restricted investments in bank stocks 7,506 7,506
Loans, net 774,341 761,820
Accrued interest receivable 2,548 2,503
Deposits 846,335 856,724
Other borrowed funds 41,443 35,949
Subordinated debentures 8,500 8,500
Accrued interest payable 1,017 792
Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 63,191 74,573
Certificates of deposit in financial institutions 1,820 1,820
Securities available for sale 100,165 101,125
Securities held to maturity 17,752 18,079
Restricted investments in bank stocks
Loans, net 771,669 760,746
Accrued interest receivable 2,548 2,503
Deposits 844,945 855,923
Other borrowed funds 39,264 34,810
Subordinated debentures 6,602 6,678
Accrued interest payable 1,017 792
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 63,191 74,573
Certificates of deposit in financial institutions
Securities available for sale
Securities held to maturity
Restricted investments in bank stocks
Loans, net
Accrued interest receivable
Deposits 243,090 253,655
Other borrowed funds
Subordinated debentures
Accrued interest payable 3 4
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents
Certificates of deposit in financial institutions 1,820 1,820
Securities available for sale 100,165 101,125
Securities held to maturity 8,848 9,020
Restricted investments in bank stocks
Loans, net
Accrued interest receivable 313 268
Deposits 601,855 602,268
Other borrowed funds 39,264 34,810
Subordinated debentures 6,602 6,678
Accrued interest payable 1,014 788
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents
Certificates of deposit in financial institutions
Securities available for sale
Securities held to maturity 8,904 9,059
Restricted investments in bank stocks
Loans, net 771,669 760,746
Accrued interest receivable 2,235 2,235
Deposits
Other borrowed funds
Subordinated debentures
Accrued interest payable