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Note 5 - Fair Value Measurements - Holdback Liability Measured at Fair Value on a Non-recurring Basis (Details) $ in Thousands | 6 Months Ended
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Mar. 31, 2022 USD ($)
Balance as of March 31, 2022 | $ 723
Fair Value, Nonrecurring [Member] | Assets Acquisition of Amika Mobile Corporation [Member] | Holdback Liability [Member] |
Balance as of September 30, 2021 | 687
Accretion | 24
Currency translation | $ 12

X
- Definition Amount of currency translation to the amount at which a liability could be incurred (settled) in a current transaction between willing parties. + References No definition available. + Details
Name: | gnss_CurrencyTranslationFairValueAdjustment
Namespace Prefix: | gnss_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value of obligations not classified as financial liabilities. Includes, but is not limited to, accounts payable and accrued liabilities, commitments, obligations, and other liabilities. + References No definition available. + Details
Name: | us-gaap_NonfinancialLiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=gnss_HoldbackLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |