Note 11 - Business Unit Segment Information (Details) - Long-lived Assets by Geographical Area (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014		Dec. 28, 2013
Note 11 - Business Unit Segment Information (Details) - Long-lived Assets by Geographical Area [Line Items]
Long-lived assets	$ 157,260	[1]	$ 150,173	[1]
UNITED STATES
Note 11 - Business Unit Segment Information (Details) - Long-lived Assets by Geographical Area [Line Items]
Long-lived assets	38,964	[1]	27,294	[1]
CHINA
Note 11 - Business Unit Segment Information (Details) - Long-lived Assets by Geographical Area [Line Items]
Long-lived assets	40,015	[1]	45,843	[1]
CANADA
Note 11 - Business Unit Segment Information (Details) - Long-lived Assets by Geographical Area [Line Items]
Long-lived assets	13,621	[1]	14,429	[1]
Other Countries [Member]
Note 11 - Business Unit Segment Information (Details) - Long-lived Assets by Geographical Area [Line Items]
Long-lived assets	$ 64,660	[1]	$ 62,607	[1]

[1] Long-lived assets consist of net property, plant and equipment.