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Warranty (Details 2) | 9 Months Ended
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Sep. 30, 2020
Product Warranties Disclosures [Abstract] |
Machine warranty, range minimum (in years) | 1 year
Period of time following a sale the majority of claims are paid, range minimum (in years) | 6 months

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- Definition The minimum period of time the machine is under warranty. + References No definition available. + Details
Name: | tnc_Machinewarrantyrangeminimum
Namespace Prefix: | tnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The typical range of period of time following a sale the majority of warranty claims are paid out on the low end of the range. + References No definition available. + Details
Name: | tnc_Periodoftimefollowingasalethemajorityofclaimsarepaidmin
Namespace Prefix: | tnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ProductWarrantiesDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration