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Note 10 - Accrued and Other Liabilities (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019
Deferred Rent Credit |  | $ 1,991
Minimum [Member] |  |
Extended Product Warranty Term (Year) | 1 year |
Maximum [Member] |  |
Extended Product Warranty Term (Year) | 2 years |

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- 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
- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121549951&loc=d3e39896-112707 + Details
Name: | us-gaap_DeferredRentCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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