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Amounts Receivable (Tables)
 12 Months Ended
Apr. 30, 2019
Text block [abstract]  
Summary of Amounts Receivables
                                                       
     April 30,
2019		      April 30,
2018		  

Taxes receivable

    $  2,486      $  1,941  

San Pedrito sale (note 8)

      0        1,359  

Trades receivable

      394        —    

Other

      216        48  
  

 

 

     

 

 

  
   $ 3,096      $ 3,348