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Note 6 - Accounts Payable and Accrued Liabilities (Details Textual) - CAD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Mar. 31, 2023
Statement Line Items [Line Items] |  |
Write-off of trade payables | $ 0 | $ 184,813
Gain (loss) on forgiveness of debt |  | $ 184,813

X
- Definition Amount of gain (loss) on forgiveness of debt. + References No definition available. + Details
Name: | fmst_GainLossOnForgivenessOfDebt
Namespace Prefix: | fmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | fmst_Statement1LineItems
Namespace Prefix: | fmst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of write-off of trade payables. + References No definition available. + Details
Name: | fmst_WriteoffOfTradePayables
Namespace Prefix: | fmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration