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Accounts payable trade and other accrued liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Trade and other payables [abstract]  
Schedule of Accounts payable trade and other accrued liabilities
December 31,
  2 0 1 8   2 0 1 7
           
Trade accounts payable $ 4,390,413   $ 3,984,898
Other accrued liabilities   2,057,557     842,045
  $ 6,447,970   $ 4,826,943