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Income Taxes (Details) - Schedule of tax expense recognized in other comprehensive income or directly in equity - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Tax Expense Recognized In Other Comprehensive Income Or Directly In Equity Abstract
Financing costs - recognized in statement of equity	$ (330)	$ (438)
Unrealized gain or loss on marketable securities - recognized in OCI	831	(61)
Total	$ 501	$ (499)

X

- Definition

The amount of costs associated with financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 82
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_82_b&doctype=Standard
-URIDate 2022-03-24

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	sa_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tax expense recognized in other comprehensive income or directly in equity.

+ References

No definition available.

+ Details

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Namespace Prefix:	sa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Unrealized gain or loss on marketable securities - recognized in OCI. .

+ References

No definition available.

+ Details

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Namespace Prefix:	sa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration