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Note 11 - Accrued and Other Liabilities (Details Textual)	6 Months Ended
	Mar. 31, 2024
Minimum [Member]
Extended Product Warranty Term	1 year
Maximum [Member]
Extended Product Warranty Term	2 years

X

- 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

- Details

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

X

- Details

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