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Note 3 - Convertible Notes Payable - Schedule of Detachable Warrants (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Mar. 31, 2024
Balance, outstanding (in shares) |  | 25,003 | 25,003 |
Outstanding, weighted average exercise price (in dollars per share) |  | $ 20 | $ 20 |
Outstanding, remaining term (Year) |  |  | 3 years 5 months 23 days | 4 years 5 months 23 days
Outstanding, intrinsic value | [1] |  | $ 0 | $ 1,010,000
Granted, outstanding (in shares) |  | 0 | 0 |
Granted, weighted average exercise price (in dollars per share) |  | $ 0 | $ 0 |
Exercised, outstanding (in shares) |  | 0 | 0 |
Exercised, weighted average exercise price (in dollars per share) |  | $ 0 | $ 0 |
Forfeited/Cancelled, outstanding (in shares) |  | 0 | 0 |
Forfeited/Cancelled, weighted average exercise price (in dollars per share) |  | $ 0 | $ 0 |
Expired, outstanding (in shares) |  | 0 | 0 |
Expired, weighted average exercise price (in dollars per share) |  | $ 0 | $ 0 |
Balance, outstanding (in shares) |  | 25,003 | 25,003 | 25,003
Outstanding, weighted average exercise price (in dollars per share) |  | $ 20 | $ 20 | $ 20
Exercisable (in shares) |  | 25,003 | 25,003 |
Exercisable, weighted average exercise price (in dollars per share) |  | $ 20 | $ 20 |
Exercisable, remaining term (Year) |  |  | 3 years 5 months 23 days |
Exercisable, intrinsic value | [1] |  | $ 0 |
[1] | Aggregate Intrinsic Value = Excess of market value over the exercise price of all in-the-money warrants. No outstanding or exercisable warrants were in-the-money as of March 31, 2024.

X
- Definition Intrinsic value of warrants currently exercisable. + References No definition available. + Details
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Balance Type: | debit
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- Definition Intrinsic value of outstanding warrants. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The number of shares into which fully or partially vested warrants outstanding as of the balance sheet date can be currently converted under the option plan. + References No definition available. + Details
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- Definition The weighted-average price as of the balance sheet date at which holders can acquire the shares on warrants outstanding and currently exercisable. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for vested portions of warrants currently exercisable or convertible. + References No definition available. + Details
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- Definition Number of warrants exercised during the current period. + References No definition available. + Details
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- Definition Weighted average price at which warrant holders acquired shares when converting their warrants into shares. + References No definition available. + Details
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- Definition Number of warrants for which the right to exercise has lapsed under the terms of the plan agreements. + References No definition available. + Details
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- Definition Weighted average price at which holders could have acquired the underlying shares with respect to the warrants that expired. + References No definition available. + Details
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- Definition Number of warrants that were cancelled during the period. + References No definition available. + Details
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- Definition Weighted average price at which holders could have acquired the underlying shares with respect to warrants that were terminated. + References No definition available. + Details
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- Definition The number of warrants granted during the period. + References No definition available. + Details
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- Definition Weighted average per share amount at which holders can acquire shares of common stock by exercise of warrants. + References No definition available. + Details
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- Definition Weighted average price at which holders can acquire the shares reserved for issuance under the warrant plan. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for warrants outstanding. + References No definition available. + Details
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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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