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Note 10 - Accrued and Other Liabilities (Details Textual) $ in Thousands, $ in Millions				12 Months Ended
	Oct. 02, 2020 CAD ($)	Oct. 02, 2020 USD ($)	Oct. 02, 2020 CAD ($)	Oct. 02, 2023	Sep. 30, 2023 USD ($)	Sep. 30, 2023 CAD ($)
Assets Acquisition of Amika Mobile Corporation [Member]
Asset Purchase Agreement, Deduction From Liability	$ 1	$ 736	$ 1		$ 799	$ 1
Asset Purchase Agreement, Deduction, Term (Year)		3 years	3 years	3 years
Minimum [Member]
Extended Product Warranty Term (Year)					1 year	1 year
Maximum [Member]
Extended Product Warranty Term (Year)					2 years	2 years

X

- Definition

The amount of deduction from liabilities under an asset purchase agreement.

+ References

No definition available.

+ Details

Name:	gnss_AssetPurchaseAgreementDeductionFromLiability
Namespace Prefix:	gnss_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The period of time that deductions can be made under an asset purchase agreement.

+ References

No definition available.

+ Details

Name:	gnss_AssetPurchaseAgreementDeductionTerm
Namespace Prefix:	gnss_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents term of extended product warranty.

+ References

No definition available.

+ Details

Name:	gnss_ExtendedProductWarrantyTerm
Namespace Prefix:	gnss_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=gnss_AssetsAcquisitionOfAmikaMobileCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: