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Note 6 - Fair Value Measurements - Holdback Liability Measured at Fair Value on a Non-recurring Basis (Details) - Evertel Technologies, LLC [Member] $ in Thousands	9 Months Ended
	Jun. 30, 2024 USD ($)
Settlement of contingent consideration liability	$ (874)
Fair Value, Nonrecurring [Member] | Holdback Liability [Member]
Balance	230
Accretion	15
Balance	245
Fair Value, Nonrecurring [Member] | Contingent Consideration Liability [Member]
Balance	890
Accretion	(16)
Settlement of contingent consideration liability	(874)
Balance	$ 0

X

- Definition

Amount of liability settled recognized arising from contingent consideration in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnss_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Fair value of obligations not classified as financial liabilities. Includes, but is not limited to, accounts payable and accrued liabilities, commitments, obligations, and other liabilities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- Details

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- Details

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- Details

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- Details

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