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Note 12 - Segmented Information (Details Textual) | 9 Months Ended
--- | ---
Dec. 31, 2023
Statement Line Items [Line Items] |
Number of reportable operating segments | 1

X
- Definition The number of reportable operating segments. + References No definition available. + Details
Name: | fmst_NumberOfReportableOperatingSegments
Namespace Prefix: | fmst_
Data Type: | xbrli:integerItemType
Balance Type: | na
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