XML 107 R85.htm IDEA: XBRL DOCUMENT
v3.19.1

Shareholder Rights Agreement (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($)
Warrants and Rights Note Disclosure [Abstract] |
Shareholder Rights Redemption Payment | $ 0

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
- References No definition available. + Details
Name: | us-gaap_WarrantsAndRightsNoteDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration