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Note 4 - Basic and Diluted Earnings (Loss) Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended March 31
  
   
2019
    
2018
  
Numerator:
                
Net income (loss)
   $
623,644
     $
(238,305
 )
Denominator:
                
Denominator for basic earnings (loss) per share – weighted average shares
    
1,746,000
      
1,845,000
  
                 
Dilutive effect of employee stock options and other warrants
    
-
      
-
  
                 
Denominator for diluted earnings (loss) per share – adjusted weighted average shares
    
1,746,000
      
1,845,000
  
                 
Basic earnings (loss) per share
   $
0.36
     $
(0.13
 )
Diluted earnings (loss) per share
   $
0.36
     $
(0.13
 )