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Note 4 - Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
For the Three
   
For the Nine
 
   
Months Ended
   
Months Ended
 
   
September 30, 2019
   
September 30, 2019
 
                         
   
2019
   
2018
   
2019
   
2018
 
                                 
Weighted-average common shares issued
   
3,647,007
     
3,620,558
     
3,641,904
     
3,613,010
 
                                 
Average treasury stock shares
   
(417,878
)    
(386,165
)    
(398,803
)    
(386,165
)
                                 
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share
   
3,229,129
     
3,234,393
     
3,243,101
     
3,226,845
 
                                 
Additional common stock equivalents (stock options and restricted stock) used to calculate diluted earnings per share
   
10,404
     
13,933
     
10,318
     
15,454
 
                                 
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share
   
3,239,533
     
3,248,326
     
3,253,419
     
3,242,299