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Note 8 - Shareholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2018
Notes Tables |
Schedule of Stockholders Equity [Table Text Block] |
(in thousands ) |  | Littelfuse, Inc. Shareholders’ Equity |  |  | Non- controlling Interest |  |  | Total |
Balance at December 30, 2017 |  | $ | 927,419 |  |  | $ | 137 |  |  | $ | 927,556 |
Net income |  |  | 36,029 |  |  |  | — |  |  |  | 36,029 |
Other comprehensive income |  |  | (279 | ) |  |  | — |  |  |  | (279 | )
Stock-based compensation |  |  | 8,714 |  |  |  | — |  |  |  | 8,714 |
Withheld shares on restricted share units for withholding taxes |  |  | (2,758 | ) |  |  | — |  |  |  | (2,758 | )
Stock options exercised |  |  | 9,609 |  |  |  | — |  |  |  | 9,609 |
Issuance of common stock (a) |  |  | 472,301 |  |  |  | — |  |  |  | 472,301 |
Cash dividends paid ($0.37 per share) |  |  | (9,198 | ) |  |  | — |  |  |  | (9,198 | )
Non-controlling interest |  |  | — |  |  |  | — |  |  |  | — |
Balance at March 31, 2018 |  | $ | 1,441,837 |  |  | $ | 137 |  |  | $ | 1,441,974 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
(in thousands ) |  | Pension and postretirement liability and reclassification adjustments (a) |  |  | Unrealized g ain /(loss) on investments |  |  | Foreign currency translation adjustment |  |  | Accumulated other comprehensive income (loss) |
Balance at December 30, 2017 |  | $ | (10,836 | ) |  | $ | 9,795 |  |  | $ | (62,627 | ) |  | $ | (63,668 | )
Cumulative effect adjustment (b) |  |  | — |  |  |  | (9,795 | ) |  |  | — |  |  |  | (9,795 | )
Activity in the period |  |  | (3 | ) |  |  | — |  |  |  | (276 | ) |  |  | (279 | )
Balance at March 31, 2018 |  | $ | (10,839 | ) |  | $ | — |  |  | $ | (62,903 | ) |  | $ | (73,742 | )

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