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Note 3 - Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
  

2020

  

2019

 
         

Weighted-average common shares issued

  7,302,845   7,286,554 
         

Average treasury stock shares

  (917,495)  (816,146)
         

Weighted-average common shares and common stock equivalents used to calculate basic earnings per share

  6,385,350   6,470,408 
         

Additional common stock equivalents (stock options and restricted stock) used to calculate diluted earnings per share

  19,174   32,398 
         

Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share

  6,404,524   6,502,806