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Share capital (Details 1) - $ / shares
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2025
Sep. 30, 2024
Stock Options [Member]          
Statement [Line Items]          
Balance at beginning (in shares) 4,842,789 4,878,288 4,880,288 4,880,288 4,714,388
Balance at beginning $ 2.37 $ 2.37 $ 2.52 $ 2.52 $ 2.44
Excercised (in shares)   (18,000)     (252,700)
Exercised during the year $ 0 $ 3.25     $ 2.65
Granted (in shares) 484,000       443,000
Granted $ 2.50 $ 0 $ 0   $ 3.42
Expired during the year (in shares) (12,000) (17,499) (2,000)   (24,400)
Expired during the year $ 3.42 $ 3.42 $ 3.42   $ 2.87
Balance at ending (in shares) 5,314,789 4,842,789 4,878,288 5,314,789 4,880,288
Balance at ending $ 2.58 $ 2.37 $ 2.37 $ 2.58 $ 2.52
Number of shares outstanding 5,314,789 4,842,789 4,878,288 5,314,789 4,880,288
Number Of Exercisable 3,207,805     3,207,805  
Stock Options 13 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 42,900     42,900  
Number of shares outstanding 42,900     42,900  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       3 months  
Number Of Exercisable 42     42  
Stock Options1 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 484,000     484,000  
Number of shares outstanding 484,000     484,000  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       9 years 9 months 10 days  
Number Of Exercisable 133,333     133,333  
Stock Options 2 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 441,000     441,000  
Number of shares outstanding 441,000     441,000  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       8 years 9 months 3 days  
Number Of Exercisable 205,007     205,007  
Stock Options 3 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 1,002,000     1,002,000  
Number of shares outstanding 1,002,000     1,002,000  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       7 years 9 months 10 days  
Number Of Exercisable 281,676     281,676  
Stock Options 4 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 298,000     298,000  
Number of shares outstanding 298,000     298,000  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       6 years 11 months 19 days  
Number Of Exercisable 298,000     298,000  
Stock Options 5 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 20,000     20,000  
Number of shares outstanding 20,000     20,000  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       6 years 4 months 28 days  
Number Of Exercisable 20,000     20,000  
Stock Options 6 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 1,494,667     1,494,667  
Number of shares outstanding 1,494,667     1,494,667  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       6 years 2 months 12 days  
Number Of Exercisable 694,667     694,667  
Stock Options 7 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 270,268     270,268  
Number of shares outstanding 270,268     270,268  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       5 years 2 months 12 days  
Number Of Exercisable 270,268     270,268  
Stock Options 8 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 1,024,000     1,024,000  
Number of shares outstanding 1,024,000     1,024,000  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       4 years 29 days  
Number Of Exercisable 1,024,000     1,024,000  
Stock Options 9 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 116,566     116,566  
Number of shares outstanding 116,566     116,566  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       2 years 7 months 24 days  
Number Of Exercisable 116,566     116,566  
Stock Options 10 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 10,667     10,667  
Number of shares outstanding 10,667     10,667  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       2 years 1 month 2 days  
Number Of Exercisable 10,667     10,667  
Stock Options 11 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 101,121     101,121  
Number of shares outstanding 101,121     101,121  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       1 year 6 months  
Number Of Exercisable 101,121     101,121  
Stock Options 12 [Member]          
Statement [Line Items]          
Balance at ending (in shares) 9,600     9,600  
Number of shares outstanding 9,600     9,600  
Weighted Average Remaining Contractual Life Of Outstanding Share Options       7 months 13 days  
Number Of Exercisable 9,600     9,600