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Stock options (Tables)
12 Months Ended
Dec. 31, 2018
Stock Options  
Stock option and warrant activity
          Weighted Average  
    Options     Exercise Price  
             
             
Outstanding at End of Year 2016     1,154,167     $ .21  
                 
Granted     0     $    
                 
Cancelled or Exercised     0     $    
                 
Outstanding at End of Year 2017     1,154,167     $ 0.21  
                 
Granted     0          
                 
Expired     1,150,000       .21  
                 
Outstanding at End of Year 2018     4,167       3.12  
Option and Warrats
  Options Outstanding   Options Exercisable
    Weighted        
    Average   Weighted   Weighted
Range of Number Remaining   Average Number Average
Exercise Outstanding Contractual   Exercise Exercisable Exercise
Prices at 12/31/18 Life   Price at 12/31/17 Price
             
$3.12 4,167 1.69 years   $3.12 4,167 $3.12