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Note 7 - Capital Stock and Reserves - Warrant Derivative Liability (Details) | Sep. 30, 2024 CAD ($) shares | Sep. 30, 2024 $ / shares | Mar. 31, 2024 CAD ($) shares | Mar. 31, 2024 $ / shares | Aug. 24, 2023 CAD ($) shares | Aug. 24, 2023 $ / shares | Mar. 31, 2023 shares
--- | --- | --- | --- | --- | --- | --- | ---
Statement Line Items [Line Items] |  |  |  |  |  |  |
Exchange rate | 1.3514 |  | 1.35397 |  | 1.3546 |  |
Unit warrants expiring August 24, 2028 [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Number of warrants outstanding (in shares) | shares | 800,000 |  | 800,000 |  | 800,000 |  | 0
Warrant price at valuation date (in dollars per share) | $ / shares |  | $ 0.4 |  | $ 0.61 |  | $ 0.76 |
Fair value of warrants outstanding (derivative liability) | $ | $ 428,663 |  | $ 656,946 |  | $ 823,597 |  |

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Represents the price at valuation date of a warrant or right. + References No definition available. + Details
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Namespace Prefix: | fmst_
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X
- Definition Represents the value of the class of warrants or rights outstanding. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Details
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