Note 17 - Earnings Per Share (Details) - Computation of Basic and Diluted Earnings Per Share under the Two-class Method (USD $) In Thousands, except Per Share data, 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
Computation of Basic and Diluted Earnings Per Share under the Two-class Method [Abstract]
Net income as reported	$ 19,511	[1]	$ 29,940	[2]	$ 24,578	[3]	$ 25,389	[4]	$ 23,658	[5]	$ 26,990	[6]	$ 26,648	[7]	$ 11,488	[7],[8]	$ 99,418	$ 88,784	$ 75,332
Less: Distributed earnings available to participating securities																		(35)	(30)
Less: Undistributed earnings available to participating securities																		(16)	(98)
Numerator for basic earnings per share —
Undistributed and distributed earnings available to common shareholders																	99,418	88,733	75,204
Add: Undistributed earnings allocated to participating securities																		16	98
Less: Undistributed earnings reallocated to participating securities																		(16)	(97)
Numerator for diluted earnings per share —
Undistributed and distributed earnings available to common shareholders																	$ 99,418	$ 88,733	$ 75,205
Denominator for basic earnings per share —
Weighted-average shares (in Shares)																	22,543	22,315	21,822
Effect of dilutive securities:
Common stock equivalents (in Shares)																	184	222	276
Denominator for diluted earnings per share —
Adjusted for weighted-average shares & assumed conversions (in Shares)																	22,727	22,537	22,098
Basic earnings per share (in Dollars per share)	$ 0.86	[1]	$ 1.33	[2]	$ 1.09	[3]	$ 1.13	[4]	$ 1.05	[5]	$ 1.20	[6]	$ 1.19	[7]	$ 0.52	[7],[8]	$ 4.41	$ 3.98	$ 3.45
Diluted earnings per share (in Dollars per share)	$ 0.86	[1]	$ 1.32	[2]	$ 1.08	[3]	$ 1.12	[4]	$ 1.04	[5]	$ 1.19	[6]	$ 1.18	[7]	$ 0.51	[7],[8]	$ 4.37	$ 3.94	$ 3.40

[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).