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Note 2 - Fair Value of Financial Instruments - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Securities held to maturity $ 17,809 $ 18,079
Reported Value Measurement [Member]    
Cash and cash equivalents 144,162 74,573
Certificates of deposit in financial institutions 1,820 1,820
Securities available for sale 105,457 101,125
Securities held to maturity 17,353 17,581
Restricted investments in bank stocks 7,506 7,506
Loans, net 760,069 761,820
Accrued interest receivable 2,552 2,503
Deposits 919,508 856,724
Other borrowed funds 42,603 35,949
Subordinated debentures 8,500 8,500
Accrued interest payable 930 792
Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 144,162 74,573
Certificates of deposit in financial institutions 1,820 1,820
Securities available for sale 105,457 101,125
Securities held to maturity 17,809 18,079
Restricted investments in bank stocks
Loans, net 759,830 760,746
Accrued interest receivable 2,552 2,503
Deposits 918,007 855,923
Other borrowed funds 40,618 34,810
Subordinated debentures 6,376 6,678
Accrued interest payable 930 792
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 144,162 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 314,413 253,655
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 105,457 101,125
Securities held to maturity 8,888 9,020
Restricted investments in bank stocks
Loans, net
Accrued interest receivable 396 268
Deposits 603,594 602,268
Other borrowed funds 40,618 34,810
Subordinated debentures 6,376 6,678
Accrued interest payable 927 788
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 8,921 9,059
Restricted investments in bank stocks
Loans, net 759,830 760,746
Accrued interest receivable 2,156 2,235
Deposits
Other borrowed funds
Subordinated debentures
Accrued interest payable