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Note 4 - Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
For the Three
 
   
Months Ended
 
   
March 31,
 
   
2020
   
2019
 
                 
Weighted-average common shares issued
   
7,298,740
     
7,270,608
 
                 
Average treasury stock shares
   
(881,631
)    
(772,330
)
                 
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share
   
6,417,109
     
6,498,278
 
                 
Additional common stock equivalents (stock options and restricted stock) used to calculate diluted earnings per share
   
12,334
     
12,290
 
                 
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share
   
6,429,443
     
6,510,568