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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual)	Jun. 30, 2020
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