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Consolidated Statements of Shareholders' Equity (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements of Shareholders' Equity (Parenthetical)
Tax withholdings for Directors, Employee Benefit and Stock Plans (in shares)	46,152us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation	9,457us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation	19,664us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Dividends paid per Common Share (in dollars per share)	$ 0.78us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.72us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.69us-gaap_CommonStockDividendsPerShareCashPaid

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Namespace Prefix:	tnc_
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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

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