Note 1 - Summary of Significant Accounting Policies - Schedule of Reported Share-based Compensation in Condensed Consolidated Interim Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Cost of Sales [Member]
Allocated share-based compensation	$ 198	$ 190	$ 313	$ 265
Research and Development Expense [Member]
Allocated share-based compensation	254	422	585	911
Selling, General and Administrative Expenses [Member]
Allocated share-based compensation	1,294	1,001	2,546	1,872
Allocated share-based compensation	1,746	1,613	3,444	3,048
Income tax benefit	(67)	(56)	(111)	(97)
Total share-based compensation, net	$ 1,679	$ 1,557	$ 3,333	$ 2,951