Note 10 - Warranty (Details Textual)	12 Months Ended
Dec. 31, 2021
Minimum [Member]
Period Of Warranty On Products (Year)	1 year
Maximum [Member]
Period Of Warranty On Products (Year)	2 years

This line item represents the minimum period of warranty that an entity offers on all of its products.

No definition available.

Name:	thmo_PeriodOfWarrantyOnProducts
Namespace Prefix:	thmo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration