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Shareholder Rights Agreement (Narrative) (Details) (USD $) | 0 Months Ended | 12 Months Ended
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Feb. 19, 2014 | Dec. 31, 2014
Warrants and Rights Note Disclosure [Abstract] |  |
Exercise price of participating cumulative preferred stock, per share |  | $ 150 tg_ExercisePriceOfParticipatingCumulativePreferredStockPerShare
Percentage of outstanding common stock shares to be acquired for exercise of rights (more than) |  | 20.00%tg_PercentageOfOutstandingCommonStockSharesToBeAcquiredForExerciseOfRights
Share-Based Compensation Arrangement by Share-based Payment Award, Price Per RIght Redeemed by Board of DIrectors in Event Agreement is Not Approved | $ 0.01 tg_ShareBasedCompensationArrangementbySharebasedPaymentAwardPricePerRIghtRedeemedbyBoardofDIrectorsinEventAgreementisNotApproved |
Shareholder Rights Redemption Payment |  | $ 323,000 tg_ShareholderRightsRedemptionPayment

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- Definition Exercise Price of Participating Cumulative Preferred Stock, Per Share + References No definition available. + Details
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- Definition Percentage of outstanding common stock shares to be acquired for exercise of rights. + References No definition available. + Details
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- Definition Share-Based Compensation Arrangement by Share-based Payment Award, Price Per RIght Redeemed by Board of DIrectors in Event Agreement is Not Approved + References No definition available. + Details
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Namespace Prefix: | tg_
Data Type: | num:perShareItemType
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- Definition Amount paid to shareholders to redeem shareholder rights per Shareholder Rights Agreement. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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