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v3.21.1

Note 9 - Warranty (Details Textual) | 3 Months Ended
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Mar. 31, 2021
Minimum [Member] |
Machine Warranty, Period (Year) | 1 year
Machine Warranty, General Period Following Sale that Majority of Claims are Paid (Month) | 6 months
Maximum [Member] |
Machine Warranty, Period (Year) | 4 years
Machine Warranty, General Period Following Sale that Majority of Claims are Paid (Month) | 9 months

X
- Definition The general period of time following a sale that the majority of claims are paid under machine warranty. + References No definition available. + Details
Name: | tnc_MachineWarrantyGeneralPeriodFollowingSaleThatMajorityOfClaimsArePaid
Namespace Prefix: | tnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The period for the machine warranty. + References No definition available. + Details
Name: | tnc_MachineWarrantyPeriod
Namespace Prefix: | tnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |