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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