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Note 5 - Fair Value Measurements - Operating Lease Right of Use Assets Currency Translation Adjustments (Details) - Fair Value, Nonrecurring [Member] - Assets Acquisition of Amika Mobile Corporation [Member] $ in Thousands | 6 Months Ended
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Mar. 31, 2022 USD ($)
Operating Lease, Right-of-use Asset [Member] |
Operating lease ROU asset, adjustment | $ 0
Reported Value Measurement [Member] |
Operating lease ROU asset, fair value | 7
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |
Operating lease ROU asset, fair value | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |
Operating lease ROU asset, fair value | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |
Operating lease ROU asset, fair value | $ 7

X
- Definition Amount of fair value portion of lessee's right to use underlying asset under operating lease. + References No definition available. + Details
Name: | gnss_OperatingLeaseRightOfUseAssetFairValueDisclosure
Namespace Prefix: | gnss_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- 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_FairValueByAssetClassAxis=gnss_OperatingLeaseRightOfUseAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |