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Note 1 - Summary of Significant Accounting Policies (Details Textual)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
Participating Interest In Loans, Losses or Charge-offs     $ 0    
Stock Issued During Period, Value, New Issues $ 55,000 $ 12,000 $ 161,000 $ 59,000  
Common Stock Including Additional Paid in Capital [Member]          
Stock Issued During Period, Shares, New Issues (in shares) | shares 5,466 3,253 9,122 5,257  
Stock Issued During Period, Value, New Issues $ 55,000 $ 12,000 $ 161,000 $ 59,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) | shares [1] 6,241 3,390 7,030 3,390  
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares) | shares   6,764 365 7,787  
Directors' Stock Purchase Plan [Member]          
Stock Issued During Period, Shares, New Issues (in shares) | shares     6,658    
Stock Issued During Period, Value, New Issues     $ 186,000    
Employee Stock Purchase Plan [Member]          
Stock Issued During Period, Shares, New Issues (in shares) | shares     2,464    
Stock Issued During Period, Value, New Issues     $ 60,000    
Credit Concentration Risk [Member] | Participating Interests in Mortgage Loans [Member]          
Number Of Mortgage Bankers 15   15    
Concentration Risk, Percentage     12.00%    
Number of Participating Interest In Loans To Other Financial Institutions Over 30 Days 17   17   26
Number of Participating Interest In Loans To Other Financial Institutions 340   340   222
Participating Interest In Loans To Other Financial Institutions Over 30 Days $ 4,600,000   $ 4,600,000   $ 6,400,000
[1] The amount shown represents the number of shares issued in cashless transactions where some taxes are netted on a portion of the exercises.