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Stock options (Tables)
12 Months Ended
Dec. 31, 2015
Stock Options Tables  
Stock option and warrant activity
          Weighted Average  
    Options     Exercise Price  
             
Outstanding at Beginning of Year 2014     60,417     $ 1.82  
                 
Granted     0          
                 
Cancelled or Exercised     (54,167 )   $ 1.73  
                 
Outstanding at End of Year 2014     6,250     $ 2.56  
                 
Granted     0     $ 0  
                 
Cancelled or Exercised     0     $ 0  
                 
Outstanding at End of Year 2015     6,250     $ 2.56  
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 12/31/15 Life Price at 12/31/15 Price
           
$1.44 - $3.12 6,250 3.45 years $2.56 6,250 $2.56