Note 15 - Business Unit Segment Information (Details) - Revenues and Long-lived Assets by Geographical Area (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
Long-lived assets
Long-lived assets	158,640								150,173								158,640	150,173	120,911
Additions to long-lived assets																	32,281	34,953	22,529
UNITED STATES
Net sales
Net sales																	313,762	274,666	222,530
Long-lived assets
Long-lived assets	34,179								27,294								34,179	27,294	14,433
Additions to long-lived assets																	9,134	4,644	2,023
CHINA
Net sales
Net sales																	189,191	158,494	142,553
Long-lived assets
Long-lived assets	40,981								45,843								40,981	45,843	41,504
Additions to long-lived assets																	7,265	7,864	7,164
Other Countries [Member]
Net sales
Net sales																	349,042	324,693	302,830
Long-lived assets
Long-lived assets	70,581								62,607								70,581	62,607	51,135
Additions to long-lived assets																	15,327	20,165	10,928
CANADA
Long-lived assets
Long-lived assets	12,899								14,429								12,899	14,429	13,839
Additions to long-lived assets																	$ 555	$ 2,280	$ 2,414

[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).