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Note 2 - Basic and Diluted Earnings (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended June 30
    
Six months ended June 30
  
   
2018
    
2017
    
2018
    
2017
  
Numerator:
                                
Net income (loss)
   $
(977,954
 )   $
(519,665
 )   $
(1,216,259
 )   $
4,128
  
Denominator:
                                
Denominator for basic earnings (loss) per share – weighted average shares
    
1,845,000
      
1,845,000
      
1,845,000
      
1,845,000
  
                                 
Dilutive effect of employee stock options and other warrants
    
-
      
-
      
-
      
1,000
  
                                 
Denominator for diluted earnings (loss) per share – adjusted weighted average shares
    
1,845,000
      
1,845,000
      
1,845,000
      
1,846,000
  
                                 
Basic earnings (loss) per share
   $
(0.53
 )   $
(0.28
 )   $
(0.66
 )   $
0.00
  
Diluted earnings (loss) per share
   $
(0.53
 )   $
(0.28
 )   $
(0.66
 )   $
0.00