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Note 7 - Capital Stock and Reserves - Warrant Derivative Liability (Details) | Jun. 30, 2024 CAD ($) shares | Jun. 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 | 1.36781 |  | 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 |  | $ 0.44 |  | $ 0.61 |  | $ 0.76 |
Fair value of warrants outstanding (derivative liability) | $ | $ 481,469 |  | $ 656,946 |  | $ 823,597 |  |

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | fmst_ClassOfWarrantOrRightOutstanding1
Namespace Prefix: | fmst_
Data Type: | xbrli:sharesItemType
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_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the value of the class of warrants or rights outstanding. + References No definition available. + Details
Name: | fmst_ClassOfWarrantsOrRightsOutstandingValue
Namespace Prefix: | fmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | fmst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
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