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Note 8 - Fair Value Measurements (Details) - Estimated Fair Values of the Company's Financial Instruments - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Financial assets:        
Cash and short term investments $ 72,315 $ 35,667 $ 30,649 $ 103,556
Securities available for sale 226,539 218,989    
FHLB and FRB Stock 4,000 4,200    
Loans held for sale 138 603    
Accrued interest receivable 2,174 2,075    
Financial liabilities:        
Deposits 865,368 795,336    
Borrowed funds 82,081 96,504    
Accrued interest payable 11,344 10,262    
Reported Value Measurement [Member]        
Financial assets:        
Securities available for sale 226,539 218,989    
Estimate of Fair Value Measurement [Member]        
Financial assets:        
Securities available for sale 226,539 218,989    
Fair Value, Inputs, Level 1 [Member]        
Financial assets:        
Securities available for sale 958 967    
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]        
Financial assets:        
Cash and short term investments 72,315 35,667    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]        
Financial assets:        
Cash and short term investments 72,315 35,667    
Fair Value, Inputs, Level 2 [Member]        
Financial assets:        
Securities available for sale 225,581 218,022    
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]        
Financial assets:        
FHLB and FRB Stock 4,035 4,154    
Loans held for sale 138 603    
Accrued interest receivable 2,174 2,075    
Financial liabilities:        
Deposits 865,369 795,336    
Borrowed funds 82,081 96,504    
Accrued interest payable 11,344 10,262    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]        
Financial assets:        
FHLB and FRB Stock 4,035 4,154    
Loans held for sale 138 603    
Accrued interest receivable 2,174 2,075    
Financial liabilities:        
Deposits 844,232 779,986    
Borrowed funds 83,744 100,020    
Accrued interest payable 11,344 10,262    
Fair Value, Inputs, Level 3 [Member]        
Financial assets:        
Securities available for sale 0 0    
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]        
Financial assets:        
Loans, net 673,398 658,747    
Mortgage servicing rights 235 333    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]        
Financial assets:        
Loans, net 672,232 659,231    
Mortgage servicing rights $ 869 $ 898