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Note 4 - Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
For the Three
 
   
Months Ended
 
   
March 31,
 
   
2019
   
2018
 
                 
Weighted-average common shares issued
   
3,635,304
     
3,606,427
 
                 
Average treasury stock shares
   
(386,165
)    
(386,165
)
                 
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share
   
3,249,139
     
3,220,262
 
                 
Additional common stock equivalents (stock options and restricted stock) used to calculate diluted earnings per share
   
6,145
     
17,807
 
                 
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share
   
3,255,284
     
3,238,069