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Note 3 - Revenue - Contract Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Sales Incentives [Member] |  |
Beginning balance | $ 12.1 | $ 13.7
Additions to sales incentive accrual | 38.0 | 18.2
Contract payments | (30.0) | (20.0)
Foreign currency fluctuations | (0.2) | 0.2
Ending balance | 19.9 | 12.1
Maintenance [Member] |  |
Foreign currency fluctuations | (0.1) | (0.6)
Beginning balance | 9.3 | 10.7
Increase in deferred revenue representing our obligation to satisfy future performance obligations | 34.5 | 21.0
Decrease in deferred revenue for amounts recognized in net sales for satisfied performance obligations | (32.5) | (21.8)
Ending balance | $ 11.2 | $ 9.3

X
- Definition The amount of decrease in contract with customer liability from contract payments. + References No definition available. + Details
Name: | tnc_ContractWithCustomerLiabilityContractPayments
Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of increase (decrease) in contract with customer liability from the impact of foreign currency. + References No definition available. + Details
Name: | tnc_ContractWithCustomerLiabilityImpactOfForeignCurrency
Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in contract with customer liability for sales incentive accruals. + References No definition available. + Details
Name: | tnc_ContractWithCustomerLiabilityIncreaseDecreaseForSalesIncentiveAccruals
Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase in obligation to transfer good or service to customer for which consideration has been received or is receivable. + References No definition available. + Details
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Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized arising from contract liability for performance obligation to be satisfied. + References No definition available. + Details
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Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=123410239&loc=SL49130611-203046-203046 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_ProductOrServiceAxis=tnc_SalesIncentivesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |