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Note 4 - Revenue Recognition - Contract Asset and Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Balance	$ 6,123
New performance obligations	8,051
Recognition of revenue as a result of satisfying performance obligations	(9,491)
Effect of exchange rate on deferred revenue	24
Balance	4,707
Less: non-current portion	(293)
Current portion	4,414
Customer Deposits [Member]
Balance	5,063
New performance obligations	7,089
Recognition of revenue as a result of satisfying performance obligations	(8,469)
Effect of exchange rate on deferred revenue
Balance	3,683
Less: non-current portion
Current portion	3,683	$ 5,063
Deferred Revenue [Member]
Balance	1,060
New performance obligations	962
Recognition of revenue as a result of satisfying performance obligations	(1,022)
Effect of exchange rate on deferred revenue	24
Balance	1,024
Less: non-current portion	(293)	(551)
Current portion	$ 731	$ 509

X

- Definition

Represents effect of exchange rate for contract with customer liability.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnss_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of increase in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from new contract.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 8
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-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044

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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044

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X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

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X

- Details

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Period Type:

X

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Balance Type:
Period Type: