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Note 14 - Commitments and Contingencies (Details Textual) - USD ($)	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Bonuses and Related Payroll Tax Expense [Member]
Increase (Decrease) in Other Employee-Related Liabilities	$ 399,646	$ 785,102

X

- Definition

Amount of increase (decrease) in employer-related costs classified as other and current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

Name:	us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=gnss_BonusesAndRelatedPayrollTaxExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: