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Note 1 - Summary of Significant Accounting Policies (Details Textual)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
Participating Interest In Loans, Losses or Charge-offs     $ 0    
Stock Issued During Period, Value, New Issues $ 143,000 $ 40,000 $ 304,000 $ 99,000  
Common Stock Including Additional Paid in Capital [Member]          
Stock Issued During Period, Shares, New Issues (in shares) | shares 5,169 1,471 14,291 6,728  
Stock Issued During Period, Value, New Issues $ 143,000 $ 40,000 $ 304,000 $ 99,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) | shares [1] 231   7,261 3,390  
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares) | shares     365 7,787  
Directors' Stock Purchase Plan [Member]          
Stock Issued During Period, Shares, New Issues (in shares) | shares     10,132    
Stock Issued During Period, Value, New Issues     $ 289,000    
Employee Stock Purchase Plan [Member]          
Stock Issued During Period, Shares, New Issues (in shares) | shares     4,159    
Stock Issued During Period, Value, New Issues     $ 101,000    
Credit Concentration Risk [Member] | Participating Interests in Mortgage Loans [Member]          
Number Of Mortgage Bankers 17   17    
Concentration Risk, Percentage     13.00%    
Number of Participating Interest In Loans To Other Financial Institutions Over 30 Days 44   44   26
Number of Participating Interest In Loans To Other Financial Institutions 326   326   222
Participating Interest In Loans To Other Financial Institutions Over 30 Days $ 9,100,000   $ 9,100,000   $ 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.