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Note 5 - Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Details) - CAD ($) | Jun. 30, 2024 | Mar. 31, 2024
--- | --- | ---
Statement Line Items [Line Items] |  |
Trade payables | $ 1,232,541 | $ 1,101,757
Advance royalty payable | 337,086 | 301,967
Accrued liabilities | 105,034 | 91,484
Due to related parties (Note 8) | 60,819 | 86,980
Trade payables | $ 1,735,480 | $ 1,582,188

X
- Definition Amount of accrued royalty payments outstanding. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

X
- References No definition available. + Details
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Period Type: | instant

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

X
- References No definition available. + Details
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