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Note 11 - Earnings Per Share (Details Textual) - shares
12 Months Ended
Jan. 17, 2018
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   37,443 53,448 113,130
IXYS Corporation [Member] | Subsequent Event [Member]        
Stock Issued During Period, Shares, Acquisitions 2,100,000      
IXYS Corporation [Member] | Subsequent Event [Member] | Conversion of IXYS Equity Awards Into Littlefuse Equity Awards [Member]        
Conversion of Stock, Shares Issued 500,000