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Note 4 - Exploration and Evaluation Assets - Exploration Expenditures (Details) - CAD ($) |  |  |  |  | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2023 | Jun. 09, 2023 | Jun. 23, 2022 | Aug. 01, 2021 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Mar. 31, 2024 | Jul. 30, 2022
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | $ 4,082,338 | $ 3,647,909 |  | $ 3,647,909 |
Cash |  |  |  |  | 140,895 | 187,849 |  | 198,829 |
Shares |  |  |  |  | 100,000 |  |  | 235,600 |
Balance |  |  |  |  | 4,323,233 |  | $ 4,323,233 | 4,082,338 |
Balance |  |  |  |  | 11,012,075 | 8,829,882 | 11,012,075 | 8,829,882 |
Assay |  |  |  |  |  |  | 27,236 | 17,857 |
Geological, consulting, and Other |  |  |  |  |  |  | 612,311 | 2,364,336 |
Exploration cost recovery |  |  |  |  |  |  | (200,000) | (200,000) |
Balance |  |  |  |  | 11,451,622 |  | 11,451,622 | 11,012,075 |
Total Balance |  |  |  |  | 15,774,855 |  | 15,774,855 | 15,094,413 |
Zoro property [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 1,909,407 | 1,909,407 |  | 1,909,407 |
Cash |  |  |  |  | 0 |  |  | 0 |
Shares |  |  |  |  | 0 |  |  | 0 |
Balance |  |  |  |  | 1,909,407 |  | 1,909,407 | 1,909,407 |
Balance |  |  |  |  | 6,552,532 | 4,653,559 | 6,552,532 | 4,653,559 |
Assay |  |  |  |  |  |  | 27,236 | 0 |
Geological, consulting, and Other |  |  |  |  |  |  | 596,910 | 1,898,973 |
Exploration cost recovery |  |  |  |  |  |  | (300,000) | 0 |
Balance |  |  |  |  | 6,876,678 |  | 6,876,678 | 6,552,532 |
Total Balance |  |  |  |  | 8,786,085 |  | 8,786,085 | 8,461,939 |
Grass River Property [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 45,255 | 43,500 |  | 43,500 |
Cash |  |  |  |  | 0 |  |  | 1,755 |
Shares |  |  |  |  | 0 |  |  | 0 |
Balance |  |  |  |  | 45,255 |  | 45,255 | 45,255 |
Balance |  |  |  |  | 680,016 | 596,124 | 680,016 | 596,124 |
Assay |  |  |  |  |  |  | 0 | 0 |
Geological, consulting, and Other |  |  |  |  |  |  | 0 | 83,892 |
Exploration cost recovery |  |  |  |  |  |  | 0 | 0 |
Balance |  |  |  |  | 680,016 |  | 680,016 | 680,016 |
Total Balance |  |  |  |  | 725,271 |  | 725,271 | 725,271 |
Peg North Property [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 400,000 | 200,000 |  | 200,000 |
Cash | $ 100,000 |  | $ 100,000 |  | 100,000 |  |  | 100,000 |
Shares |  | $ 100,000 | $ 100,000 |  | 100,000 |  |  | 100,000 |
Balance |  |  |  |  | 600,000 |  | 600,000 | 400,000 |
Balance |  |  |  |  | 849,406 | 660,472 | 849,406 | 660,472 |
Assay |  |  |  |  |  |  | 0 | 15,188 |
Geological, consulting, and Other |  |  |  |  |  |  | 3,909 | 173,746 |
Exploration cost recovery |  |  |  |  |  |  | 0 | 0 |
Balance |  |  |  |  | 853,315 |  | 853,315 | 849,406 |
Total Balance |  |  |  |  | 1,453,315 |  | 1,453,315 | 1,249,406 |
Winston Property [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 1,338,793 | 1,334,548 |  | 1,334,548 |
Cash |  |  |  |  | 40,895 |  |  | 4,245 |
Shares |  |  |  |  | 0 |  |  | 0 |
Balance |  |  |  |  | 1,379,688 |  | 1,379,688 | 1,338,793 |
Balance |  |  |  |  | 419,233 | 371,909 | 419,233 | 371,909 |
Assay |  |  |  |  |  |  | 0 | 0 |
Geological, consulting, and Other |  |  |  |  |  |  | 0 | 47,324 |
Exploration cost recovery |  |  |  |  |  |  | 0 | 0 |
Balance |  |  |  |  | 419,233 |  | 419,233 | 419,233 |
Total Balance |  |  |  |  | 1,798,921 |  | 1,798,921 | 1,758,026 |
Jean Lake Property [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 250,000 | 150,000 |  | 150,000 |
Cash |  |  |  | $ 25,000 | 0 |  |  | 50,000 | $ 50,000
Shares |  |  |  | $ 25,000 | 0 |  |  | 50,000 | $ 50,000
Balance |  |  |  |  | 250,000 |  | 250,000 | 250,000 |
Balance |  |  |  |  | 2,465,023 | 2,509,453 | 2,465,023 | 2,509,453 |
Assay |  |  |  |  |  |  | 0 | 2,669 |
Geological, consulting, and Other |  |  |  |  |  |  | 8,492 | 152,901 |
Exploration cost recovery |  |  |  |  |  |  | 100,000 | (200,000) |
Balance |  |  |  |  | 2,573,515 |  | 2,573,515 | 2,465,023 |
Total Balance |  |  |  |  | 2,823,515 |  | 2,823,515 | 2,715,023 |
Jol Lithium Property [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 11,730 | 10,454 |  | 10,454 |
Cash |  |  |  |  | 0 |  |  | 1,276 |
Shares |  |  |  |  | 0 |  |  | 0 |
Balance |  |  |  |  | 11,730 |  | 11,730 | 11,730 |
Balance |  |  |  |  | 45,865 | 38,365 | 45,865 | 38,365 |
Assay |  |  |  |  |  |  | 0 | 0 |
Geological, consulting, and Other |  |  |  |  |  |  | 3,000 | 7,500 |
Exploration cost recovery |  |  |  |  |  |  | 0 | 0 |
Balance |  |  |  |  | 48,865 |  | 48,865 | 45,865 |
Total Balance |  |  |  |  | 60,595 |  | 60,595 | 57,595 |
Lac Simard South property [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 127,153 | 0 |  | 0 |
Cash |  |  |  |  | 0 |  |  | 41,553 |
Shares |  |  |  |  | 0 |  |  | 85,600 |
Balance |  |  |  |  | 127,153 |  | 127,153 | 127,153 |
Balance |  |  |  |  | 0 | $ 0 | 0 | 0 |
Assay |  |  |  |  |  |  | 0 | 0 |
Geological, consulting, and Other |  |  |  |  |  |  | 0 | 0 |
Exploration cost recovery |  |  |  |  |  |  | 0 | 0 |
Balance |  |  |  |  | 0 |  | 0 | 0 |
Total Balance |  |  |  |  | $ 127,153 |  | $ 127,153 | $ 127,153 |

X
- Definition Amount of acquisition and exploration costs incurred on exploration and evaluation assets. + References No definition available. + Details
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Namespace Prefix: | fmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount of acquisition costs incurred on exploration and evaluation assets. + References No definition available. + Details
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Namespace Prefix: | fmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount of expense for assay on exploration and evaluation assets. + References No definition available. + Details
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Namespace Prefix: | fmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Amount of cost recovery on exploration and evaluation assets. + References No definition available. + Details
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Namespace Prefix: | fmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Amount of exploration costs incurred on exploration and evaluation assets. + References No definition available. + Details
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- Definition Amount of expense for geological and consulting on exploration and evaluation assets. + References No definition available. + Details
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- Definition Amount fo increase (decrease) in equity for purchase of evaluation and exploration assets. + References No definition available. + Details
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Namespace Prefix: | fmst_
Data Type: | xbrli:monetaryItemType
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- References No definition available. + Details
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- References No definition available. + Details
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- Details
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- Details
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Balance Type: |
Period Type: |

X
- Details
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- Details
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- Details
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