Note 15 - Employee Retention Tax Credit (Details Textual)	9 Months Ended
Sep. 30, 2021 USD ($)
Employee Retention Tax Credit	$ 842,000

Amount of refundable payroll tax credit provided under the Coronavirus Aid, Relief, and Economic Security (CARES) Act.

No definition available.

Name:	thmo_EmployeeRetentionTaxCredit
Namespace Prefix:	thmo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration