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Note 11 - Accrued and Other Liabilities (Details Textual) $ in Thousands, $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 02, 2020 USD ($) | Oct. 02, 2020 CAD ($) | Sep. 30, 2021
Assets Acquisition of Amika Mobile Corporation [Member] |  |  |
Asset Purchase Agreement, Deduction From Liability | $ 787 | $ 1 |
Asset Purchase Agreement, Deduction, Term (Year) | 3 years | 3 years |
Minimum [Member] |  |  |
Extended Product Warranty Term (Year) |  |  | 1 year
Maximum [Member] |  |  |
Extended Product Warranty Term (Year) |  |  | 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: |