Note 4 - Restructuring Activities (Details Textual) $ in Thousands	Jun. 30, 2021 USD ($)
CHINA
Discontinued Operations, Revenue, Remaining Performance Obligation, Amount	$ 12

Represents the amount of remaining performance obligation associated with revenue from discontinued operations.

No definition available.

Name:	ftek_DiscontinuedOperationsRevenueRemainingPerformanceObligationAmount
Namespace Prefix:	ftek_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant