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Note 4 - Exploration and Evaluation Assets - Royalty Schedule (Details) | Sep. 30, 2024 CAD ($)
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Silver price under 5.00 [member] |
Statement Line Items [Line Items] |
Minimum monthly royalty | $ 125
Production royalty | 3.00%
Silver price between 5.00 and 6.99 [member] |
Statement Line Items [Line Items] |
Minimum monthly royalty | $ 250
Production royalty | 4.00%
Silver price between 7.00 and 8.99 [member] |
Statement Line Items [Line Items] |
Minimum monthly royalty | $ 500
Production royalty | 5.00%
Silver price between 9.00 and 10.99 [member] |
Statement Line Items [Line Items] |
Minimum monthly royalty | $ 1,000
Production royalty | 6.00%
Silver price between 11.00 and 14.99 [member] |
Statement Line Items [Line Items] |
Minimum monthly royalty | $ 1,500
Production royalty | 7.00%
Silver price over 15.00 [member] |
Statement Line Items [Line Items] |
Minimum monthly royalty | $ 2,000
Production royalty | 8.00%

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- Definition Represents the minimum monthly royalty. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the production royalty percentage. + References No definition available. + Details
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Namespace Prefix: | fmst_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
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- Details
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Period Type: |

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- Details
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- Details
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- Details
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- Details
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Data Type: | na
Balance Type: |
Period Type: |