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Note 2 - Acquisition - Pro Forma Information Adjustments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Apr. 01, 2017
Net income |  | $ 63,933 | $ 17,462
Adjustment to Amortization [Member] |  |  |
Net income | [1] | 1,902 | (6,276)
Adjustment to Depreciation [Member] |  |  |
Net income |  |  | (94)
Acquisition-related Costs [Member] |  |  |
Net income | [2] | 9,976 | (9,976)
Amortization of Inventory Step Up [Member] |  |  |
Net income | [3] | 17,896 | (22,156)
Adjustment to Stock Compensation [Member] |  |  |
Net income | [4] | 4,479 | (5,013)
Adjustment to Interest Expense [Member] |  |  |
Net income | [5] |  | (2,582)
Adjustment to Income Tax [Member] |  |  |
Net income |  | $ (7,701) | $ 15,374
[1] | The amortization adjustment for the three months ended March 31, 2018 primarily reflects the reduction of amortization expense in the period related to the Order backlog intangible asset. The Order backlog has a useful life of twelve months and will be fully amortized in the fiscal 2017 pro forma results. The amortization adjustment for the three months ended April 1, 2017 reflects incremental amortization resulting for the measurement of intangibles at their fair values.
[2] | The transaction cost adjustments reflect the reversal of certain bank and attorney fees from the three months ended March 31, 2018 and recognition of those fees during the three months ended April 1, 2017.
[3] | The amortization of inventory step-up adjustment reflects the reversal of the amount recognized during the three months ended March 31, 2018 and the recognition of a full quarter of the amortization during the three months end April 1, 2017. The inventory step-up is being amortized over five months as the inventory is sold.
[4] | The stock compensation adjustment reflects the reversal of the portion of stock compensation for IXYS stock options that were converted to Littelfuse stock options and expensed immediately during the three months ended March 31, 2018. The adjustment for the three months ended April 1, 2017 reflect the incremental stock compensation for the converted stock options.
[5] | The interest expense adjustment reflects incremental interest expense related to the financing of the transaction.

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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