Note 14 - Product Line Sale (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Apr. 02, 2016	Jul. 02, 2016	Jun. 27, 2015
Cost of Sales [Member]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	$ (400)
Selling, General and Administrative Expenses [Member]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	(100)
Research and Development Expense [Member]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	(100)
Amortization of Intangibles Assets [Member]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	(900)
Gain (Loss) on Sale of Assets and Asset Impairment Charges	$ (1,400)	$ (1,391)