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Note 4 - Leases - Sublease Investment (Details) - CAD ($)	9 Months Ended		12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Mar. 31, 2023
Statement Line Items [Line Items]
Net investment in sublease	$ 31,537	$ 88,360	$ 88,360
Finance income on net investment in finance lease	1,314	$ 7,432	8,879
Payments received	(32,851)		(65,702)
Net investment in sublease	0		$ 31,537
Current portion	0
Non-current portion	$ 0

X

- Definition

The amount of net investment in lease classified as current.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of net investment in lease classified as noncurrent.

+ References

No definition available.

+ Details

Name:	fmst_NetInvestmentInLeaseNoncurrent1
Namespace Prefix:	fmst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of net investment in sublease.

+ References

No definition available.

+ Details

Name:	fmst_NetInvestmentInSublease
Namespace Prefix:	fmst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	fmst_Statement1LineItems
Namespace Prefix:	fmst_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of finance income on the net investment in the finance lease. [Refer: Finance income; Net investment in finance lease]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2023-01-01
-Paragraph 90
-Subparagraph a
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_90_a_ii&doctype=Standard
-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash inflow from finance income received, classified as operating activities. [Refer: Finance income]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2023-01-01
-Paragraph 31
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_31&doctype=Standard
-URIDate 2023-03-23

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration