Schedule II - Valuation and Qualifying Accounts Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2004
Valuation and Qualifying Accounts [Abstract]
Reserve On Note Receivable	$ 0.5ldl_ReserveOnNoteReceivable

The amount indicates the reserve on a note receivable during the period.

No definition available.

Name:	ldl_ReserveOnNoteReceivable
Namespace Prefix:	ldl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration