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Recoverable taxes (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Recoverable taxes [Abstract]  
Schedule of Recoverable Taxes
  December 31,
  2 0 1 8   2 0 1 7
           
Valued Added Tax $ 2,262,172   $ 2,075,615
Income Tax   137,408     146,333
Other   8,294     8,427
  $ 2,407,874   $ 2,230,375