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Note 4 - Business Combinations - Estimate Fair Value of the Identifiable Assets Acquired and Estimated Useful Lives (Details) - USD ($) $ in Thousands | Jun. 07, 2021 | Oct. 02, 2020 | Jun. 07, 2020
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Zonehaven, Inc [Member] |  |  |
Fair value | $ 10,100 |  |
Useful lives (Year) | 6 years 8 months 12 days |  |
Zonehaven, Inc [Member] | Developed Technology Rights [Member] |  |  |
Fair value | $ 8,800 |  |
Useful lives (Year) | 7 years |  |
Zonehaven, Inc [Member] | Trade Names [Member] |  |  |
Fair value | $ 400 |  |
Useful lives (Year) | 5 years |  |
Zonehaven, Inc [Member] | Customer Relationships [Member] |  |  |
Fair value | $ 900 |  |
Useful lives (Year) | 5 years |  |
Assets Acquisition of Amika Mobile Corporation [Member] |  |  |
Fair value |  | $ 2,820 | $ 10,100
Useful lives (Year) |  | 7 years |
Assets Acquisition of Amika Mobile Corporation [Member] | Developed Technology Rights [Member] |  |  |
Fair value |  | $ 2,500 |
Useful lives (Year) |  | 7 years |
Assets Acquisition of Amika Mobile Corporation [Member] | Customer Relationships [Member] |  |  |
Fair value |  | $ 320 |
Useful lives (Year) |  | 7 years |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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