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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 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration