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Note 9 - Financial and Off-balance Sheet Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 11,726 $ 16,331 $ 15,248 $ 10,721
Equities 9,600 4,975    
Available-for-sale 344,194 374,570    
Restricted investment in stocks 2,668 1,501    
Loans held-for-sale 404      
Net loans 771,694 725,442    
Mortgage servicing rights 466 483    
Accrued interest receivable 3,573 3,545    
Deposits with no stated maturities 985,726 993,948    
Short-term borrowings 85,646 55,756    
Accrued interest payable 371 384    
Cash and cash equivalents 11,726 16,331    
Restricted investment in stocks 2,668 1,501    
Loans held-for-sale 415      
Net loans 774,814 727,341    
Mortgage servicing rights 609 585    
Accrued interest receivable 3,573 3,545    
Short-term borrowings 85,646 55,756    
Accrued interest payable 371 384    
Fair Value, Inputs, Level 1 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Equities 9,600 4,975    
Cash and cash equivalents 11,726 16,331    
Short-term borrowings 85,646 55,756    
Fair Value, Inputs, Level 2 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Available-for-sale 344,076 374,355    
Restricted investment in stocks 2,668 1,501    
Loans held-for-sale 415      
Accrued interest receivable 3,573 3,545    
Accrued interest payable 371 384    
Fair Value, Inputs, Level 3 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Available-for-sale 118 215    
Net loans 774,814 727,341    
Mortgage servicing rights 609 585    
Standby Letters of Credit [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Commitments to extend credit 65      
With No Stated Maturities [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Deposits with no stated maturities 763,007 768,766    
Deposits with no stated maturities 763,007 768,766    
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 763,007 768,766    
With Stated Maturities [Member]        
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]        
Deposits with no stated maturities 222,719 225,182    
Deposits with no stated maturities 218,800 223,325    
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 $ 218,800 $ 223,325