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Note 8 - Financial and Off-balance Sheet Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 20,542 $ 10,721 $ 32,138 $ 16,991
Trading 2,358 3,596    
Investment securities available-for-sale 382,296 390,475    
Restricted investment in bank stocks 910 1,017    
Loans held-for-sale 903 789    
Net loans 651,320 625,685    
Mortgage servicing rights 494 498    
Accrued interest receivable 2,774 3,128    
Deposits with no stated maturities 942,891 913,355    
Short-term borrowings 45,265 52,660    
Accrued interest payable 303 335    
Cash and cash equivalents 20,542 10,721    
Restricted investment in bank stocks 910 1,017    
Loans held-for-sale 925 789    
Net loans 649,870 626,052    
Mortgage servicing rights 595 579    
Accrued interest receivable 2,774 3,128    
Short-term borrowings 45,265 52,660    
Accrued interest payable 303 335    
Fair Value, Inputs, Level 1 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Investment securities available-for-sale 6,107 8,503    
Cash and cash equivalents 20,542 10,721    
Short-term borrowings 45,265 52,660    
Fair Value, Inputs, Level 2 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Trading 2,358 3,596    
Investment securities available-for-sale 373,766 379,691    
Restricted investment in bank stocks 910 1,017    
Loans held-for-sale 925 789    
Accrued interest receivable 2,774 3,128    
Accrued interest payable 303 335    
Fair Value, Inputs, Level 3 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Investment securities available-for-sale 2,423 2,281    
Net loans 649,870 626,052    
Mortgage servicing rights 595 579    
With No Stated Maturities [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Deposits with no stated maturities 716,424 687,773    
Deposits with no stated maturities 716,424 687,773    
With No Stated Maturities [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Deposits with no stated maturities 716,424 687,773    
With Stated Maturities [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Deposits with no stated maturities 226,467 225,582    
Deposits with no stated maturities 225,847 225,403    
With Stated Maturities [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Deposits with no stated maturities $ 225,847 $ 225,403