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Note 17 - Subsequent Event (Details Textual) - Subsequent Event [Member] - Golden Valley Minnesota [Member] - USD ($) $ in Millions |  | 3 Months Ended
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Apr. 14, 2022 | Jun. 30, 2022
Proceeds from Sale of Buildings | $ 4.1 |
Gain (Loss) on Disposition of Property Plant Equipment, Total |  | $ 3.7

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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Period Type: | duration

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- Definition The cash inflow from sale of buildings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585 + Details
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- Details
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=tnc_GoldenValleyMinnesotaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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