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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual) | Mar. 31, 2020
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Number of Wholly Owned Subsidiaries | 3

X
- Definition Represents the number of wholly owned subsidiaries of the reporting entity as of a certain date. + References No definition available. + Details
Name: | gnss_NumberOfWhollyOwnedSubsidiaries
Namespace Prefix: | gnss_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant