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Condensed Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current Assets:    
Allowance For Doubtful Receivables And Sales Returns $ 3,849tnc_AllowanceForDoubtfulAccountsReceivableAndSalesReturnsCurrent $ 3,936tnc_AllowanceForDoubtfulAccountsReceivableAndSalesReturnsCurrent
Shareholders' Equity:    
Preferred Stock, par value per share $ 0.02us-gaap_PreferredStockParOrStatedValuePerShare $ 0.02us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred Stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common Stock, par value per share $ 0.375us-gaap_CommonStockParOrStatedValuePerShare $ 0.375us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, shares authorized 60,000,000us-gaap_CommonStockSharesAuthorized 60,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, shares issued 18,403,712us-gaap_CommonStockSharesIssued 18,415,047us-gaap_CommonStockSharesIssued
Common Stock, shares outstanding 18,403,712us-gaap_CommonStockSharesOutstanding 18,415,047us-gaap_CommonStockSharesOutstanding