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Shareholder Rights Agreement (Details) (USD $) | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 19, 2014 | Sep. 30, 2014 | Mar. 31, 2014 | Nov. 18, 2013
Warrants and Rights Note Disclosure [Abstract] |  |  |  |
Number of rights attached to each outstanding share of common stock |  |  |  | 1 tg_ClassofWarrantorRightNumberofRightsAttachedtoEachOutstandingShareofCommonStock
Portion of shares each Right can buy |  |  | 0.01 tg_PortionOfSharesEachRightCanBuy |
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 |  | 20.00%tg_PercentageOfOutstandingCommonStockSharesToBeAcquiredForExerciseOfRights |  |
Percentage of common stock ownership required in a tender offer for exercise of rights |  | 20.00%tg_PercentageOfCommonStockOwnershipRequiredInTenderOfferForExerciseOfRights |  |
Price per rIght redeemed by board of dIrectors in event agreement is not approved | $ 0.01 tg_ShareBasedCompensationArrangementbySharebasedPaymentAwardPricePerRIghtRedeemedbyBoardofDIrectorsinEventAgreementisNotApproved |  |  |
Shareholder Rights Redemption Payment |  |  | $ 300,000 tg_ShareholderRightsRedemptionPayment |

X
- Definition Class of Warrant or Right, Number of Rights Attached to Each Outstanding Share of Common Stock + References No definition available. + Details
Name: | tg_ClassofWarrantorRightNumberofRightsAttachedtoEachOutstandingShareofCommonStock
Namespace Prefix: | tg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Exercise Price of Participating Cumulative Preferred Stock, Per Share + References No definition available. + Details
Name: | tg_ExercisePriceOfParticipatingCumulativePreferredStockPerShare
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of common stock ownership required in a tender offer for exercise of rights. + References No definition available. + Details
Name: | tg_PercentageOfCommonStockOwnershipRequiredInTenderOfferForExerciseOfRights
Namespace Prefix: | tg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of outstanding common stock shares to be acquired for exercise of rights. + References No definition available. + Details
Name: | tg_PercentageOfOutstandingCommonStockSharesToBeAcquiredForExerciseOfRights
Namespace Prefix: | tg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Portion of shares each Right can buy + References No definition available. + Details
Name: | tg_PortionOfSharesEachRightCanBuy
Namespace Prefix: | tg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | tg_ShareBasedCompensationArrangementbySharebasedPaymentAwardPricePerRIghtRedeemedbyBoardofDIrectorsinEventAgreementisNotApproved
Namespace Prefix: | tg_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount paid to shareholders to redeem shareholder rights per Shareholder Rights Agreement. + References No definition available. + Details
Name: | tg_ShareholderRightsRedemptionPayment
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_WarrantsAndRightsNoteDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration