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Note 7 - Capital Stock and Reserves - Stock Option Transactions (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 $ / shares | Mar. 31, 2024 $ / shares | Mar. 31, 2023 $ / shares
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 3.81 | $ 5.87 |
Share options, balance | 333,500 | 211,300 |
Share options, granted | 36,000 | 238,500 |
Share options, exercised | 0 | (36,000) |
Share options, forfeited | (52,500) | (80,300) |
Share options, balance | 317,000 | 333,500 | 211,300
Share options, exercisable | 317,000 | 333,500 |
Weighted average exercise price, balance (in CAD per share) | $ 7.38 | $ 10.81 |
Weighted average exercise price, exercised (in CAD per share) | 0 | 4.7 |
Weighted average exercise price, forfeited (in CAD per share) | 7.51 | 9.95 |
Weighted average exercise price, balance (in CAD per share) | 6.96 | 7.38 | $ 10.81
Weighted average exercise price, exercisable (in CAD per share) | $ 6.96 | $ 7.38 |
Weighted average remaining life (years) (Year) | 2 years 6 months 3 days | 2 years 7 months 9 days | 2 years 6 months 25 days
Stock options expiring March 8, 2025 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 15.5 | $ 15.5 |
Share options, balance | 4,000 | 4,000 |
Share options, granted | 0 | 0 |
Share options, exercised | 0 | 0 |
Share options, forfeited | 0 | 0 |
Share options, balance | 4,000 | 4,000 | 4,000
Share options, exercisable | 4,000 | 4,000 |
Stock options expiring March 1, 2024 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) |  | $ 16.5 |
Share options, balance | 0 | 15,000 |
Share options, granted |  | 0 |
Share options, exercised |  | 0 |
Share options, forfeited |  | (15,000) |
Share options, balance |  | 0 | 15,000
Share options, exercisable |  | 0 |
Stock options expiring September 2, 2025 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 12.75 | $ 12.75 |
Share options, balance | 20,000 | 20,000 |
Share options, granted | 0 | 0 |
Share options, exercised | 0 | 0 |
Share options, forfeited | 0 | 0 |
Share options, balance | 20,000 | 20,000 | 20,000
Share options, exercisable | 20,000 | 20,000 |
Stock Options Expiring November 14, 2024 [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) |  | $ 3.65 |
Share options, balance | 0 | 0 |
Share options, granted |  | 36,000 |
Share options, exercised |  | (36,000) |
Share options, forfeited |  | 0 |
Share options, balance |  | 0 | 0
Share options, exercisable |  | 0 |
Stock options expiring September 6, 2025 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 13.75 | $ 13.75 |
Share options, balance | 8,000 | 8,000 |
Share options, granted | 0 | 0 |
Share options, exercised | 0 | 0 |
Share options, forfeited | 0 | 0 |
Share options, balance | 8,000 | 8,000 | 8,000
Share options, exercisable | 8,000 | 8,000 |
Stock options expiring November 20, 2025 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 4 | $ 4 |
Share options, balance | 6,000 | 6,000 |
Share options, granted | 0 | 0 |
Share options, exercised | 0 | 0 |
Share options, forfeited | 0 | 0 |
Share options, balance | 6,000 | 6,000 | 6,000
Share options, exercisable | 6,000 | 6,000 |
Stock options expiring December 2, 2025 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 9 | $ 9 |
Share options, balance | 62,000 | 62,000 |
Share options, granted | 0 | 0 |
Share options, exercised | 0 | 0 |
Share options, forfeited | (20,000) | 0 |
Share options, balance | 42,000 | 62,000 | 62,000
Share options, exercisable | 42,000 | 62,000 |
Stock options expiring December 13, 2025 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 9.5 | $ 9.5 |
Share options, balance | 21,000 | 31,000 |
Share options, granted | 0 | 0 |
Share options, exercised | 0 | 0 |
Share options, forfeited | 0 | (10,000) |
Share options, balance | 21,000 | 21,000 | 31,000
Share options, exercisable | 21,000 | 21,000 |
Stock options expiring March 26, 2026 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 3.3 | $ 3.3 |
Share options, balance | 20,000 | 0 |
Share options, granted | 0 | 20,000 |
Share options, exercised | 0 | 0 |
Share options, forfeited | 0 | 0 |
Share options, balance | 20,000 | 20,000 | 0
Share options, exercisable | 20,000 | 20,000 |
Stock options expiring August 25, 2026 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 5.65 | $ 5.65 |
Share options, balance | 17,500 | 0 |
Share options, granted | 0 | 17,500 |
Share options, exercised | 0 | 0 |
Share options, forfeited | 0 | 0 |
Share options, balance | 17,500 | 17,500 | 0
Share options, exercisable | 17,500 | 17,500 |
Stock options expiring September 6, 2026 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 6.6 | $ 6.6 |
Share options, balance | 40,000 | 0 |
Share options, granted | 0 | 40,000 |
Share options, exercised | 0 | 0 |
Share options, forfeited | (7,500) | 0 |
Share options, balance | 32,500 | 40,000 | 0
Share options, exercisable | 32,500 | 40,000 |
Stock options expiring January 15, 2026 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) |  | $ 7.25 |
Share options, balance | 0 | 35,300 |
Share options, granted |  | 0 |
Share options, exercised |  | 0 |
Share options, forfeited |  | (35,300) |
Share options, balance |  | 0 | 35,300
Share options, exercisable |  | 0 |
Stock options expiring November 1, 2026 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 7.5 | $ 7.5 |
Share options, balance | 10,000 | 10,000 |
Share options, granted | 0 | 0 |
Share options, exercised | 0 | 0 |
Share options, forfeited | 0 | 0 |
Share options, balance | 10,000 | 10,000 | 10,000
Share options, exercisable | 10,000 | 10,000 |
Stock Options Expiring December 4, 2026 [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 5.47 | $ 5.47 |
Share options, balance | 20,000 | 0 |
Share options, granted | 0 | 20,000 |
Share options, exercised | 0 | 0 |
Share options, forfeited | 0 | 0 |
Share options, balance | 20,000 | 20,000 | 0
Share options, exercisable | 20,000 | 20,000 |
Stock options expiring September 6, 2028 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 6.6 | $ 6.6 |
Share options, balance | 85,000 | 0 |
Share options, granted | 0 | 85,000 |
Share options, exercised | 0 | 0 |
Share options, forfeited | (25,000) | 0 |
Share options, balance | 60,000 | 85,000 | 0
Share options, exercisable | 60,000 | 85,000 |
Stock options expiring February 15, 2029 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 3.98 | $ 3.98 |
Share options, balance | 20,000 | 0 |
Share options, granted | 0 | 20,000 |
Share options, exercised | 0 | 0 |
Share options, forfeited | 0 | 0 |
Share options, balance | 20,000 | 20,000 | 0
Share options, exercisable | 20,000 | 20,000 |
Stock options expiring July 23, 2029 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) | $ 3.91 |  |
Share options, balance | 0 |  |
Share options, granted | 36,000 |  |
Share options, exercised | 0 |  |
Share options, forfeited | 0 |  |
Share options, balance | 36,000 | 0 |
Share options, exercisable | 36,000 |  |
Stock options expiring February 16, 2027 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Share options, exercise price (in CAD per share) |  | $ 17.5 |
Share options, balance | 0 | 20,000 |
Share options, granted |  | 0 |
Share options, exercised |  | 0 |
Share options, forfeited |  | (20,000) |
Share options, balance |  | 0 | 20,000
Share options, exercisable |  | 0 |

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