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Note 7 - Accumulated Other Comprehensive Income (Loss) (Details Textual) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Pension and Other Post-retirement Benefit Plans, Liability Adjustment Tax	$ 1.2	$ 1.1

X

- Definition

Represents accumulated Other Comprehensive Income (Loss), Pension and Other Post-retirement Benefit Plans, Liability Adjustment Tax.

+ References

No definition available.

+ Details

Name:	lfus_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansLiabilityAdjustmentTax
Namespace Prefix:	lfus_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant