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Note 8 - Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Reported Value Measurement [Member]    
Cash and cash equivalents $ 70,381,000 $ 109,174,000
Interest-bearing time deposits 15,540,000 16,655,000
Fair Value 247,250,000 186,751,000
Fair Value 3,000 4,000
Loans held for sale 2,553,000 3,081,000
Loans, net 366,367,000 359,166,000
FHLB and other stock 1,650,000 1,650,000
Accrued interest receivable 2,361,000 2,244,000
Deposits 658,747,000 637,177,000
Accrued interest payable 137,000 167,000
Cost method investment (included in other assets)   711,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 70,381,000 109,174,000
Interest-bearing time deposits 0 0
Fair Value 103,000 118,000
Fair Value 0 0
Loans held for sale 0 0
Loans, net 0 0
FHLB and other stock 0 0
Accrued interest receivable 0 0
Deposits 0 0
Accrued interest payable 0 0
Cost method investment (included in other assets)   0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents 0 0
Interest-bearing time deposits 15,565,000 16,696,000
Fair Value 247,147,000 186,633,000
Fair Value 3,000 4,000
Loans held for sale 2,614,000 3,145,000
Loans, net 0 0
FHLB and other stock 1,650,000 1,650,000
Accrued interest receivable 2,361,000 2,244,000
Deposits 0 0
Accrued interest payable 137,000 167,000
Cost method investment (included in other assets)   711,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents 0 0
Interest-bearing time deposits 0 0
Fair Value 0 0
Fair Value 0 0
Loans held for sale 0 0
Loans, net 374,656,000 359,784,000
FHLB and other stock 0 0
Accrued interest receivable 0 0
Deposits 658,389,000 636,406,000
Accrued interest payable 0 0
Cost method investment (included in other assets)   0
Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 70,381,000 109,174,000
Interest-bearing time deposits 15,565,000 16,696,000
Fair Value 247,250,000 186,751,000
Fair Value 3,000 4,000
Loans held for sale 2,614,000 3,145,000
Loans, net 374,656,000 359,784,000
FHLB and other stock 1,650,000 1,650,000
Accrued interest receivable 2,361,000 2,244,000
Deposits 658,389,000 636,406,000
Accrued interest payable 137,000 167,000
Cost method investment (included in other assets)   711,000
Fair Value 247,250,000 186,751,000
Fair Value $ 3,000 $ 4,000