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Note 14 - Commitments and Contingencies (Details Textual) - USD ($) | 9 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Bonuses and Related Payroll Tax Expense [Member] |  |
Increase (Decrease) in Other Employee-Related Liabilities | $ 1,143,267 | $ 902,274

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- 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

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