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Note 7 - Capital Stock and Reserves - Summary of Warrant Transactions (Details) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 $ / shares shares | Mar. 31, 2024 $ / shares shares | Mar. 31, 2024 $ / shares $ / shares shares | Mar. 31, 2023 $ / shares shares | Sep. 30, 2024 $ / shares | Mar. 31, 2024 $ / shares
Statement Line Items [Line Items] |  |  |  |  |  |
Issued, warrants, weighted average exercise price (in CAD per share) | $ / shares |  |  | $ 6.25 |  |  |
Unit warrants expiring August 24, 2028 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
warrants, exercise price (in dollars per share) | $ / shares |  |  |  |  | $ 6.25 | $ 6.25
Balances, number of warrants (in shares) | 800,000 | 0 | 0 |  |  |
Issued, number of warrants (in shares) | 0 | 800,000 | 800,000 |  |  |
Exercised, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Cancelled, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Balances, number of warrants (in shares) | 800,000 | 800,000 | 800,000 | 0 |  |
March 13, 2026 (in shares) | 0 | (800,000) | (800,000) |  |  |
Unit warrants expiring December 2, 2023 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
warrants, exercise price (in dollars per share) | $ / shares |  | $ 6.5 | $ 6.5 |  |  |
Balances, number of warrants (in shares) | 0 | 24,000 | 24,000 |  |  |
Issued, number of warrants (in shares) |  | 0 | 0 |  |  |
Exercised, number of warrants (in shares) |  | 0 | 0 |  |  |
Cancelled, number of warrants (in shares) |  | (24,000) | (24,000) |  |  |
Balances, number of warrants (in shares) |  | 0 | 0 | 24,000 |  |
March 13, 2026 (in shares) |  | 0 | 0 |  |  |
Agent warrants expiring August 19, 2024 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
warrants, exercise price (in dollars per share) | $ / shares | $ 10 | $ 10 | $ 10 |  |  |
Balances, number of warrants (in shares) | 5,765 | 5,765 | 5,765 |  |  |
Issued, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Exercised, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Cancelled, number of warrants (in shares) | (5,765) | 0 | 0 |  |  |
Balances, number of warrants (in shares) | 0 | 5,765 | 5,765 | 5,765 |  |
March 13, 2026 (in shares) | 0 | 0 | 0 |  |  |
Unit warrants expiring March 13, 2026 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
warrants, exercise price (in dollars per share) | $ / shares | $ 4 | $ 4 | $ 4 |  |  |
Balances, number of warrants (in shares) | 341,592 | 0 | 0 |  |  |
Issued, number of warrants (in shares) | 0 | 341,592 | 341,592 |  |  |
Exercised, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Cancelled, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Balances, number of warrants (in shares) | 341,592 | 341,592 | 341,592 | 0 |  |
March 13, 2026 (in shares) | 0 | (341,592) | (341,592) |  |  |
Agent warrants expiring August 21, 2028 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
warrants, exercise price (in dollars per share) | $ / shares | $ 6.25 | $ 6.25 | $ 6.25 |  |  |
Balances, number of warrants (in shares) | 40,000 | 0 | 0 |  |  |
Issued, number of warrants (in shares) | 0 | 40,000 | 40,000 |  |  |
Exercised, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Cancelled, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Balances, number of warrants (in shares) | 40,000 | 40,000 | 40,000 | 0 |  |
March 13, 2026 (in shares) | 0 | (40,000) | (40,000) |  |  |
Unit warrants expiring April 29, 2026 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
warrants, exercise price (in dollars per share) | $ / shares | $ 4 |  |  |  |  |
Balances, number of warrants (in shares) | 0 |  |  |  |  |
Issued, number of warrants (in shares) | 247,471 |  |  |  |  |
Exercised, number of warrants (in shares) | 0 |  |  |  |  |
Cancelled, number of warrants (in shares) | 0 |  |  |  |  |
Balances, number of warrants (in shares) | 247,471 | 0 | 0 |  |  |
March 13, 2026 (in shares) | (247,471) |  |  |  |  |
Agent warrants expiring March 13, 2026 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
warrants, exercise price (in dollars per share) | $ / shares | $ 3.4 | $ 3.4 | $ 3.4 |  |  |
Balances, number of warrants (in shares) | 3,274 | 0 | 0 |  |  |
Issued, number of warrants (in shares) | 0 | 3,274 | 3,274 |  |  |
Exercised, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Cancelled, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Balances, number of warrants (in shares) | 3,274 | 3,274 | 3,274 | 0 |  |
March 13, 2026 (in shares) | 0 | (3,274) | (3,274) |  |  |
Agent warrants expiring April 29, 2026 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
warrants, exercise price (in dollars per share) | $ / shares | $ 3.4 |  |  |  |  |
Balances, number of warrants (in shares) | 0 |  |  |  |  |
Issued, number of warrants (in shares) | 51 |  |  |  |  |
Exercised, number of warrants (in shares) | 0 |  |  |  |  |
Cancelled, number of warrants (in shares) | 0 |  |  |  |  |
Balances, number of warrants (in shares) | 51 | 0 | 0 |  |  |
March 13, 2026 (in shares) | (51) |  |  |  |  |
Unit warrants [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Balances, number of warrants (in shares) | 1,141,592 | 24,000 | 24,000 |  |  |
Issued, number of warrants (in shares) | 247,471 | 1,141,592 | 1,141,592 |  |  |
Exercised, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Cancelled, number of warrants (in shares) | 0 | (24,000) | (24,000) |  |  |
Balances, number of warrants (in shares) | 1,389,063 | 1,141,592 | 1,141,592 | 24,000 |  |
Balances, warrants, weighted average exercise price (in CAD per share) | $ / shares | $ 5.58 | $ 6.5 |  |  |  |
Issued, warrants, weighted average exercise price (in CAD per share) | (per share) | 4 |  | $ 5.58 |  |  |
Exercised, warrants, weighted average exercise price (in CAD per share) | $ / shares | 0 | 0 |  |  |  |
Cancelled, warrants, weighted average exercise price (in CAD per share) | $ / shares | 0 | 6.5 | $ 6.5 |  |  |
Balances, warrants, weighted average exercise price (in CAD per share) | $ / shares | $ 5.3 | $ 5.58 |  | $ 6.5 |  |
Weighted average remaining life (years) (Year) | 3 years 5 months 15 days | 3 years 8 months 1 day | 3 years 8 months 1 day | 8 months 1 day |  |
March 13, 2026 (in shares) | (247,471) | (1,141,592) | (1,141,592) |  |  |
Agent warrants [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Balances, number of warrants (in shares) | 49,039 | 5,765 | 5,765 |  |  |
Issued, number of warrants (in shares) | 51 | 43,274 | 43,274 |  |  |
Exercised, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Cancelled, number of warrants (in shares) | 0 | 0 | 0 |  |  |
Balances, number of warrants (in shares) | 43,325 | 49,039 | 49,039 | 5,765 |  |
Balances, warrants, weighted average exercise price (in CAD per share) | $ / shares | $ 6.5 | $ 10 |  |  |  |
Issued, warrants, weighted average exercise price (in CAD per share) | $ / shares | 3.4 | 3.4 |  |  |  |
Exercised, warrants, weighted average exercise price (in CAD per share) | $ / shares | 0 | 0 |  |  |  |
Cancelled, warrants, weighted average exercise price (in CAD per share) | $ / shares | 0 | 0 | $ 0 |  |  |
Balances, warrants, weighted average exercise price (in CAD per share) | $ / shares | $ 6.03 | $ 6.5 |  | $ 10 |  |
Weighted average remaining life (years) (Year) | 3 years 10 months 17 days | 2 years 11 months 8 days | 2 years 11 months 8 days |  |  |
March 13, 2026 (in shares) | (51) | (43,274) | (43,274) |  |  |

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