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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Business Acquisition [Line Items]
Amount of total installment payments	$ 1,500

X

- Definition

The amount of total installment payments to be made by acquiring company as part of business acquisition.

+ References

No definition available.

+ Details

Name:	tnc_AmountOfTotalInstallmentPayments
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration