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Recoverable taxes (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of Recoverable taxes [Abstract]  
Schedule of Recoverable Taxes
December 31,
  2 0 1 9   2 0 1 8
           
Valued Added Tax $ 781,082   $ 2,262,172
Income Tax   185,243     137,408
Other   445     8,294
  $ 966,770   $ 2,407,874