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Note 12 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2017 | [1] | Sep. 30, 2017 | [2] | Jul. 01, 2017 | [3] | Apr. 01, 2017 | [4] | Dec. 31, 2016 | [5] | Oct. 01, 2016 | [6] | Jul. 02, 2016 | [7] | Apr. 02, 2016 | [8] | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Net sales |  | $ 304,849 | $ 317,889 | $ 313,355 | $ 285,441 | $ 284,518 | $ 280,331 | $ 271,912 | $ 219,398 | $ 1,221,534 | $ 1,056,159 | $ 867,864
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 63,011 | 53,137 | 41,641
Operating income |  | $ 50,780 | $ 58,609 | $ 60,270 | $ 48,852 | $ 40,988 | $ 27,526 | $ 29,702 | $ 32,428 | 218,511 | 130,644 | 104,157
Interest expense |  |  |  |  |  |  |  |  |  | 13,380 | 8,628 | 4,091
Foreign exchange loss (gain) |  |  |  |  |  |  |  |  |  | 2,376 | 472 | (1,465)
Other (income) expense, net |  |  |  |  |  |  |  |  |  | (1,282) | (1,730) | (5,417)
Income before income taxes |  |  |  |  |  |  |  |  |  | 204,037 | 123,274 | 106,948
Electronics [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 661,928 | 535,191 | 405,497
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 35,215 | 29,141 | 22,936
Operating income |  |  |  |  |  |  |  |  |  | 155,880 | 117,088 | 78,194
Automotive [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 453,227 | 415,200 | 339,957
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 22,459 | 18,107 | 13,437
Operating income |  |  |  |  |  |  |  |  |  | 62,571 | 59,905 | 53,086
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 106,379 | 105,768 | 122,410
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 5,337 | 5,889 | 5,268
Operating income |  |  |  |  |  |  |  |  |  | 10,334 | 3,615 | 18,094
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating income | [9] |  |  |  |  |  |  |  |  | $ (10,274) | $ (49,964) | $ (45,217)
[1] | In the fourth quarter of 2017, the Company recorded an estimated one-time tax charge of $49 million for the enactment of the Tax Cuts and Jobs Act for deemed repatriation of unremitted earnings of foreign subsidiaries, $1.4 million in acquisition and integration costs and $0.7 million in restructuring and production costs related to the transfer of Asian operations.
[2] | In the third quarter of 2017, the Company recorded $4.8 million in acquisition and integration costs and $1.5 million in restructuring and production costs related to the transfer of Asian operations.
[3] | In the second quarter of 2017, the Company recorded $0.3 million in acquisition and integration costs.
[4] | In the first quarter of 2017, the Company $1.5 million in acquisition and integration costs
[5] | In the fourth quarter of 2016, the Company recorded ($0.1) million gain related to the Company's transfer of its reed sensor manufacturing operations from the U.S. and China to the Philippines, $1.2 million of restructuring costs, $3.2 million in acquisition and integration costs and $0.3 million in non-cash inventory charges related to the 2016 acquisitions.
[6] | In the third quarter of 2016, the Company recorded $0.9 million of restructuring costs, $5.9 million in acquisition and integration costs, $14.8 million of charges related to the impairment of the Custom Products reporting unit and $0.5 million in non-cash inventory charges as noted above.
[7] | In the second quarter of 2016, the Company recorded $0.7 million related to the reed sensor manufacturing transfer as noted above, $0.1 million of restructuring costs, $6.1 million in acquisition and integration costs, $0.3 million in charges related to the closure of the manufacturing facility in Denmark and $6.9 million in non-cash inventory charges as noted above.
[8] | In the first quarter of 2016, the Company recorded $1.0 million related to the reed sensor manufacturing transfer as noted above, $0.4 million of restructuring costs, $6.2 million in acquisition and integration costs, and $1.6 million in charges related to the closure of the manufacturing facility in Denmark.
[9] | Included in "Other" Operating income (loss) for 2017 are costs related to the acquisition and integration costs associated with the Company's completed and pending acquisitions ($8.0 million in Cost of sales ("COS") and Selling, general, and administrative expenses ("SG&A") and charges related to restructuring and production transfers in the Company's Asia operations ($2.2 million in SG&A). Included in "Other" Operating income (loss) for 2016 are costs related to the impairment of the Custom Products reporting unit ($14.8 million), acquisition and integration costs associated with the Company's 2016 acquisitions ($29.2 million in COS and SG&A), transfer of the Company's reed switch manufacturing operations from its Lake Mills, Wisconsin and Suzhou, China locations to the Philippines ($1.6 million in COS), impairment and severance costs related to the closure of the Company's manufacturing facility in Denmark ($1.9 million in SG&A), and restructuring costs ($2.5 million in SG&A and Research and development expenses). Included in "Other" Operating income (loss) for 2015 are costs related to the transfer of the Company's reed switch manufacturing operations from its Lake Mills, Wisconsin and Suzhou, China locations to the Philippines ($5.2 million in COS), acquisition related fees ($4.6 million included in SG&A), pension settlement and other costs ($31.9 million in SG&A), and restructuring costs ($3.6 million in SG&A).

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