Note 3 - Goodwill and Other Purchased Intangible Assets - Changes in Carrying Value of Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 24, 2016		Dec. 26, 2015
Balance	$ 60,264	[1]	$ 63,132
Impact of currency exchange	764		(2,868)
Balance	$ 61,028		$ 60,264	[1]

[1] Derived from December 26, 2015 audited financial statements