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Note 33 - Changes in Non-cash Working Capital (Tables)
 12 Months Ended
Mar. 31, 2018
Statement Line Items [Line Items]  
Disclosure of detailed information in changes in non-cash working capital [text block]
    As at     As at  
    March 31, 2018     March 31, 2017  
Accounts receivable and unbilled revenues   $
(108,900
 )   $
18,069
  
Gas in storage    
538
      
(9,282
 )
Prepaid expenses and deposits    
(15,534
 )    
3,361
  
Provisions    
(3,501
 )    
(9,774
 )
Trade and other payables    
90,972
      
(25,130
 )
    $
(36,425
 )   $
(22,756
 )