Note 14 - Related Party Transactions - Subsidiary Ownership (Details) - Minera Los Lagartos, S.A. de C.V. [member] - MEXICO	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Statement Line Items [Line Items]
MAG's effective interest	100.00%	100.00%
Juanicipio Entities [member]
Statement Line Items [Line Items]
Equity method investment, ownership percentage	44.00%

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2021-01-01
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-Subparagraph b
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-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2021-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
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-URIDate 2021-03-24

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2021-01-01
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-Subparagraph c
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration