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Note 8 - Related Party Transactions (Tables) | 12 Months Ended
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Mar. 31, 2024
Statement Line Items [Line Items] |
Disclosure of transaction with key management personnel [text block] |
|  | Management fees |  |  | Consulting fees |  |  | Share-based payments |  |  | Total |
Period ended June 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current and former directors, officers and companies controlled by them |  | $ | 166,500 |  |  | $ | - |  |  | $ | - |  |  | $ | 166,500 |
Period ended June 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current and former directors, officers and companies controlled by them |  | $ | 105,000 |  |  | $ | 30,000 |  |  | $ | - |  |  | $ | 135,000 |
Disclosure of transactions between related parties [text block] |
|  | June 30, 2024 |  |  | March 31, 2024 |
Current and former directors, officers and companies controlled by them |  | $ | 60,819 |  |  | $ | 86,980 |

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- Definition The disclosure of transaction with key management personnel. + References No definition available. + Details
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Namespace Prefix: | fmst_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:textBlockItemType
Balance Type: | na
Period Type: | duration