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Note 2 - Basic and Diluted Earnings (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
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
 )