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Note 2 - Basic and Diluted Earnings (Loss) Per Share
 9 Months Ended
Sep. 30, 2017
Notes to Financial Statements  
Earnings Per Share [Text Block]
Note
2
--
Basic and Diluted Earnings (Loss) per Share
        
               
 
Basic earnings (loss) per common share is computed using the weighted average number of common shares outstanding during the period.
  Diluted earnings (loss) per share is computed using the weighted average number of common shares and potential dilutive common shares that were outstanding during the period.  Potential dilutive common shares consist of outstanding stock options, outstanding stock warrants, and convertible preferred stock.
               
 
The following table sets forth the computation of basic and diluted earnings (loss) per share:
    
 
   
Three months ended September 30
    
Nine months ended September 30
  
   
2017
    
2016
    
2017
    
2016
  
Numerator:
                                
Net income (loss)
   $
(319,103
 )   $
134,478
     $
(314,975
 )   $
(897,346
 )
                                 
Denominator:
                                
Denominator for basic earnings (loss) per
share--weighted average shares
    
1,845,000
      
1,846,000
      
1,845,000
      
1,846,000
  
Dilutive effect of employee stock options and other warrants
    
-
      
-
      
-
      
-
  
                                 
Denominator for diluted earnings (loss) per
share--adjusted weighted average shares
    
1,845,000
      
1,846,000
      
1,845,000
      
1,846,000
  
                                 
Basic earnings (loss) per share
   $
(0.17
 )   $
0.07
     $
(0.17
 )   $
(0.49
 )
Diluted earnings (loss) per share
   $
(0.17
 )   $
0.07
     $
(0.17
 )   $
(0.49
 )
               
 
Options and warrants to purchase
146,715
shares of common stock for the
three
months and
nine
months ended
September 30, 2017,
respectively, were
not
included in the denominator for diluted earnings (loss) per share because their effect would be antidilutive or because the shares were deemed contingently issuable.
  Options and warrants to purchase
265,001
and
267,184
shares of common stock for the
three
months and
nine
months ended
September 30, 2016,
respectively, were
not
included in the denominator for diluted earnings (loss) per share because their effect would be antidilutive or because the shares were deemed contingently issuable.