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Note 13 - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020	Oct. 01, 2019
Increase in Lease Liability with 10% Increase in Index			$ 19
Operating Lease, Liability	$ 6,829		6,829		$ 7,166
Operating Lease, Right-of-Use Asset	$ 5,048		$ 5,048		$ 5,285
Operating Lease, Weighted Average Remaining Lease Term (Year)	6 years 10 months 9 days		6 years 10 months 9 days
Operating Lease, Weighted Average Discount Rate, Percent	4.12%		4.12%
Operating Lease, Expense	$ 246	$ 228	$ 735	$ 674
Short-term Lease, Cost	1	$ 0	3	$ 0
Assets Acquisition of Amika Mobile Corporation [Member]
Operating Lease, Liability	259		259
Operating Lease, Right-of-Use Asset	$ 259		$ 259
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability						$ 7,815
Operating Lease, Right-of-Use Asset						$ 5,824

X

- Definition

The amount of increase in lease liability with every 10% increase in index.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnss_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977

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X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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X

- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980

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X

- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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- Definition

Amount of short-term lease cost, excluding expense for lease with term of one month or less.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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