Note 1 - Basis of Presentation	6 Months Ended
Jul. 02, 2016
Notes to Financial Statements
Basis of Accounting [Text Block]	1. Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of Littelfuse, Inc. and its subsidiaries (the “company”) have been prepared in accordance with U.S. Generally Accepted Accounting Principles (GAAP) for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and disclosures normally included in the consolidated balance sheet, statements of net income and comprehensive income and cash flows prepared in conformity with U.S. GAAP have been condensed or omitted as permitted by such rules and regulations, although the company believes that the disclosures made are adequate to make the information not misleading. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Operating results for the periods ended July 2, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016. For further information, refer to the company’s consolidated financial statements and the notes thereto incorporated by reference in the company’s Annual Report on Form 10-K for the year ended January 2, 2016. The company’s unaudited consolidated statement of income for the three months ended July 2, 2016 include the operating results of PolySwitch for the three month period from March 25, 2016 through June 25, 2016. The company’s unaudited consolidated statements of income for the three and six months ended July 2, 2016 both exclude a portion of the operating results of the PolySwitch business for the eight day period of June 26, 2016 through July 2, 2016. The related excluded portion of the operating results of PolySwitch for this eight day period is not material to the company’s financial statements for the three and six months ended July 2, 2016 and will be included within the company’s statement of income for the quarter ended October 1, 2016.

1. Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements of Littelfuse, Inc. and its subsidiaries (the “company”) have been prepared in accordance with U.S.

Generally Accepted Accounting Principles

(GAAP) for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and disclosures normally included in the consolidated balance sheet, statements of net income and comprehensive income and cash flows prepared in conformity with U.S. GAAP have been condensed or omitted as permitted by such rules and regulations, although the company believes that the disclosures made are adequate to make the information not misleading. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Operating results for the periods ended July 2, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016. For further information, refer to the company’s consolidated financial statements and the notes thereto incorporated by reference in the company’s Annual Report on Form 10-K for the year ended January 2, 2016.

The company’s unaudited consolidated statement of income for the three months ended July 2, 2016 include the operating results of PolySwitch for the three month period from March 25, 2016 through June 25, 2016. The company’s unaudited consolidated statements of income for the three and six months ended July 2, 2016 both exclude a portion of the operating results of the PolySwitch business for the eight day period of June 26, 2016 through July 2, 2016. The related excluded portion of the operating results of PolySwitch for this eight day period is not material to the company’s financial statements for the three and six months ended July 2, 2016 and will be included within the company’s statement of income for the quarter ended October 1, 2016.