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Note 3 - Fair Value of Financial Instruments - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Reported Value Measurement [Member]    
Cash and cash equivalents $ 61,885 $ 45,530
Certificates of deposit in financial institutions 1,670 1,715
Securities available for sale 104,860 91,651
Securities held to maturity 19,651 19,903
Restricted investments in bank stocks 6,939 6,576
Loans, net 714,050 579,104
Accrued interest receivable 2,247 1,819
Deposits 805,783 660,746
Other borrowed funds 35,665 23,946
Subordinated debentures 8,500 8,500
Accrued interest payable 517 449
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 61,885 45,530
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 215,933 176,499
Other borrowed funds
Subordinated debentures
Accrued interest payable 2 4
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents
Certificates of deposit in financial institutions 1,670 1,715
Securities available for sale 104,860 91,651
Securities held to maturity 10,356 9,814
Restricted investments in bank stocks
Loans, net
Accrued interest receivable 361 224
Deposits 590,489 484,636
Other borrowed funds 35,990 23,672
Subordinated debentures 5,801 5,368
Accrued interest payable 515 445
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 10,381 10,976
Restricted investments in bank stocks
Loans, net 722,276 582,427
Accrued interest receivable 1,886 1,595
Deposits
Other borrowed funds
Subordinated debentures
Accrued interest payable
Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 61,885 45,530
Certificates of deposit in financial institutions 1,670 1,715
Securities available for sale 104,860 91,651
Securities held to maturity 20,737 20,790
Restricted investments in bank stocks
Loans, net 722,276 582,427
Accrued interest receivable 2,247 1,819
Deposits 806,422 661,135
Other borrowed funds 35,990 23,672
Subordinated debentures 5,801 5,368
Accrued interest payable 517 449
Securities available for sale 104,860 91,651
Securities held to maturity $ 20,737 $ 20,790