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Note 10 - Accrued and Other Liabilities - Changes in Warranty Reserve (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Beginning balance | $ 146 | $ 126
Warranty provision | 86 | 56
Warranty settlements | (73) | (36)
Ending balance | $ 159 | $ 146

X
- Definition Amount of increase (decrease) in the standard and extended product warranty accrual from changes in estimates attributable to new warranties issuance and preexisting product warranties. + References No definition available. + Details
Name: | gnss_ProductWarrantyAccrualIncreaseDecreaseForNewWarrantiesIssuanceAndAdjustmentPreexistingWarranties
Namespace Prefix: | gnss_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126907703&loc=d3e12565-110249 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(5) -URI https://asc.fasb.org/extlink&oid=126907703&loc=d3e12565-110249 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI https://asc.fasb.org/extlink&oid=126907703&loc=d3e12565-110249 + Details
Name: | us-gaap_ProductWarrantyAccrualPayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration