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Note 5 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
201
9
    
201
8
  
Net income
   $
868,963
     $
1,273,619
  
Numerator for basic and diluted earnings per share
   $
868,963
     $
1,273,619
  
                 
Denominator for basic earnings per share – weighted-average shares
    
9,009,752
      
9,264,446
  
                 
Effect of dilutive securities:
                
Restricted stock
    
285
      
365
  
Dilutive potential common shares
    
285
      
365
  
                 
Denominator for diluted earnings per share – weighted-average shares
    
9,010,037
      
9,264,811
  
                 
Basic earnings per share
   $
0.10
     $
0.14
  
Diluted earnings per share
   $
0.10
     $
0.14