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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012
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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