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Note 11 - Earnings Per Share | 12 Months Ended
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Dec. 30, 2017
Notes to Financial Statements |
Earnings Per Share [Text Block] | 11 . Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share:
(in thousands, except per share amounts ) |  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income as reported |  | $ | 119,519 |  |  | $ | 104,488 |  |  | $ | 80,866 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 22,687 |  |  |  | 22,559 |  |  |  | 22,565 |
Effect of dilutive securities |  |  | 244 |  |  |  | 168 |  |  |  | 154 |
Diluted |  |  | 22,931 |  |  |  | 22,727 |  |  |  | 22,719 |
Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 5.27 |  |  | $ | 4.63 |  |  | $ | 3.58 |
Diluted earnings per share |  | $ | 5.21 |  |  | $ | 4.60 |  |  | $ | 3.56 |
Potential shares of common stock attributable to stock options excluded from the earnings per share calculation because their effect would be anti-dilutive were 37,443 shares, 53,448 shares, and 113,130 shares in 2017, 2016, and 2015, respectively. On January 17, 2018, the Company acquired IXYS through a combination of cash, Littelfuse common stock, and the value of converted, or cash settled IXYS equity awards. The Company issued approximately 2.1 million shares of Littelfuse common stock and conve rted IXYS equity awards into approximately 0.5 million Littelfuse equity awards.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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