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Long-Term Debt (Details) - Long-term debt (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt, including current portion $ 1,811us-gaap_LongTermDebt $ 2,872us-gaap_LongTermDebt
Less portion due within one year 1,811us-gaap_LongTermDebtCurrent 2,478us-gaap_LongTermDebtCurrent
Long-term debt    394us-gaap_LongTermDebtNoncurrent
8¼% Limited Convertible Senior Subordinated Notes Due 2012 [Member]    
Debt Instrument [Line Items]    
Long-term debt, including current portion 1,083us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= tlx_EightAndOneForthPercentLimitedConvertibleSeniorSubordinatedNotesDue2012Member		 1,083us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= tlx_EightAndOneForthPercentLimitedConvertibleSeniorSubordinatedNotesDue2012Member
9½% Subordinated Debentures Due 2012 [Member]    
Debt Instrument [Line Items]    
Long-term debt, including current portion 334us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= tlx_NineAndHalfPercentSubordinatedDebenturesDue2012Member		 334us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= tlx_NineAndHalfPercentSubordinatedDebenturesDue2012Member
Term Loan Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt, including current portion    1,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= tlx_TermLoanCreditFacilityMember
Real Estate Mortgage Secured [Member]    
Debt Instrument [Line Items]    
Long-term debt, including current portion $ 394us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= tlx_RealEstateMortgageSecuredMember		 $ 455us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= tlx_RealEstateMortgageSecuredMember