Note 13 - Asset Impairment (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Mar. 28, 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	$ (1,391)