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Segmented Information and Economic Dependence - Summary of Geographical Segments (Details) - CAD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2024
Jan. 31, 2023
Apr. 30, 2023
Disclosure Of Geographical Areas [Line Items]          
Revenues $ 6,221 $ 5,171 $ 18,059 $ 15,044  
Non-current assets 63,632   63,632   $ 61,021
Net income (loss) (2,940) (4,699) (9,132) (21,431)  
Interest and accretion 186 119 531 212  
Amortization and depreciation 1,309 1,688 4,156 4,702  
United States of America          
Disclosure Of Geographical Areas [Line Items]          
Revenues 3,369 3,006 9,009 6,942  
Europe          
Disclosure Of Geographical Areas [Line Items]          
Revenues 2,594 1,889 7,960 6,816  
Canada          
Disclosure Of Geographical Areas [Line Items]          
Revenues 112 121 356 518  
Australia          
Disclosure Of Geographical Areas [Line Items]          
Revenues 31 90 179 326  
North America          
Disclosure Of Geographical Areas [Line Items]          
Non-current assets 4,650   4,650   1,025
Net income (loss) 765 (3,146) 51 (14,327)  
Interest and accretion 95 3 175 14  
Amortization and depreciation 137 195 439 563  
North America | Corporate          
Disclosure Of Geographical Areas [Line Items]          
Non-current assets 81   81   89
Net income (loss) (3,335) (620) (6,022) (4,500)  
Interest and accretion 14 2 4 17  
Amortization and depreciation 3 4 9 11  
Belgium          
Disclosure Of Geographical Areas [Line Items]          
Non-current assets 37,515   37,515   40,406
Net income (loss) (1,488) (1,267) (3,829) (3,276)  
Interest and accretion (37) 3 0 12  
Amortization and depreciation 608 554 1,817 1,717  
Netherlands          
Disclosure Of Geographical Areas [Line Items]          
Non-current assets 21,386   21,386   $ 19,501
Net income (loss) 1,118 334 668 672  
Interest and accretion 114 111 352 169  
Amortization and depreciation 561 935 1,891 2,411  
Other          
Disclosure Of Geographical Areas [Line Items]          
Revenues $ 115 $ 65 $ 555 $ 442