Note 15 - Business Unit Segment Information (Details) - Business Unit Segment Information (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 27, 2014		Sep. 27, 2014		Jun. 28, 2014		Mar. 29, 2014		Dec. 28, 2013		Sep. 28, 2013		Jun. 29, 2013		Mar. 30, 2013		Dec. 27, 2014		Dec. 28, 2013		Dec. 29, 2012
Net sales
Net sales	$ 206,620	[1]	$ 217,608	[2]	$ 220,908	[3]	$ 206,859	[4]	$ 198,129	[5]	$ 201,040	[6]	$ 187,766	[7]	$ 170,918	[7],[8]	$ 851,995		$ 757,853		$ 667,913
Depreciation and amortization
Depreciation and amortization																	41,875		34,480		31,433
Operating income (loss)
Operating income	26,391	[1]	40,130	[2]	33,719	[3]	33,590	[4]	32,823	[5]	37,559	[6]	31,382	[7]	28,117	[7],[8]	133,830		129,881		106,870
Interest expense																	4,903		2,917		1,701
Impairment and equity in net loss of unconsolidated affiliate (2)																		[9]	10,678	[9]	7,334	[9]
Foreign exchange loss (gain)																	3,925		(3,303)		3,179
Other expense (income), net																	(6,644)		(4,646)		(5,396)
Income before income taxes																	131,646		124,235		100,052
Electronics [Member]
Net sales
Net sales																	410,065		367,052		329,466
Depreciation and amortization
Depreciation and amortization																	22,177		20,735		20,741
Operating income (loss)
Operating income																	86,981		69,559		51,422
Automotive [Member]
Net sales
Net sales																	325,415		267,207		206,222
Depreciation and amortization
Depreciation and amortization																	14,204		9,928		6,822
Operating income (loss)
Operating income																	45,086		39,170		29,817
Electrical [Member]
Net sales
Net sales																	116,515		123,594		132,225
Depreciation and amortization
Depreciation and amortization																	5,494		3,817		3,870
Operating income (loss)
Operating income																	10,674		24,363		32,794
Other Segments [Member]
Operating income (loss)
Operating income																	$ (8,911)	[10]	$ (3,211)	[10]	$ (7,163)	[10]

[1] In the fourth quarter of 2014, the company recorded $2.2 million in charges related to severance and to the company's reorganization of its internal legal structure toenable the up-streaming of cash to the U.S. The company also recorded $0.3 million in acquisition costs and $0.3 million in impairment costs.

[2] In the third quarter of 2014, the company recorded $1.1 million in charges related to the company's reorganization of its internal legal structure, as noted above.

[3] In the second quarter of 2014, the company recorded a $1.4 million non-cash charge related to the step-up of inventory from the SymCom acquisition (See Note 2), $2.0 million in severance charges and $0.2 million in acquisition costs.

[4] In the first quarter of 2014, the company recorded a $1.4 million non-cash charge related to the step-up of inventory from the SymCom acquisition (See Note 2).

[5] In the fourth quarter of 2013, the company recorded a $2.8 million charge to income tax expense related to the company's impairment of its investment in Shocking Technologies in the fourth quarter of 2012 (See Note 6). The company also recorded a $0.5 million non-cash credit related to the step-up of inventory from the Hamlin acquisition (See Note 2) and $0.2 million in acquisition expenses for the Hamlin acquisition.

[6] In the third quarter of 2013, the company recorded a $0.3 million non-cash charge related to the step-up of inventory from the Hamlin acquisition (See Note 2). Thecompany also recorded $0.3 million in acquisition charges related to the Hamlin acquisition.

[7] In the second quarter of 2013, the company recorded a $1.7 million non-cash charge related to the step-up of inventory from the Hamlin acquisition (See Note 2).The company also recorded $1.2 million in acquisition charges related to the Hamlin acquisition.

[8] In the first quarter of 2013, the company recorded a $10.7 million charge related to the impairment of Shocking Technologies. Additionally, the company restated netincome for a $3.3 million charge to income tax expense related to the company's investment in Shocking Technologies (See Note 6).

[9] During the first quarter of 2013, the company recorded approximately $10.7 million related to the impairment of Shocking Technologies. During the fourth quarter of 2012, the company recorded approximately $7.3 million related to the impairment and equity in net loss of its investment in Shocking Technologies (See Note 6).

[10] Included in "Other" Operating income (loss) for 2014 are acquisition related fees ($0.4 million included in Selling, general and administrative expenses ("SG&A")), non-cash charges for the sale of inventory that had been stepped-up to fair value at the acquisition date of SymCom ($2.8 million included in Cost of sales ("COS")) (See Note 2), severance charges ($2.7 million in COS and $0.5 million in SG&A), internal legal restructuring costs ($2.2 million in SG&A) and asset impairments ($0.2 million in Research and development and $0.1 million in SG&A). Included in "Other" Operating income (loss) for 2013 are acquisition related fees ($1.7 million included in SG&A) and non-cash charges for the sale of inventory that had been stepped-up to fair value at the acquisition date of Hamlin ($1.5 million included in COS (See Note 2)). Included in "Other" Operating income (loss) for 2012 are acquisition related fees ($1.0 million included in SG&A), non-cash charges for the sale of inventory that had been stepped-up to fair value at the acquisition date of Accel and Terra Power ($0.6 million included in COS), charges related to a pension liability settlement ($5.1 million included in SG&A) (see Note 12), and asset impairment charges related to the sale of the Dnsen, Germany facility ($0.5 million included in SG&A) (See Note 11).