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Stock options and awards (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of information relating to stock option transactions

   2020   2019 
       Weighted       Weighted 
       Average       Average 
       Exercise       Exercise 
   Shares   Price   Shares   Price 
Options outstanding beginning of the year   20,000   $2.07    50,000   $1.24 
Options exercised   (20,000)   2.07    (30,000)   0.69 
Total   --   $--    20,000   $2.07