Note 2 - Business Acquisitions - Fair Value of Contingent Consideration (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017		Dec. 31, 2016
Adjustments charged to expense	$ 657	$ 1,423
Adjustment to contingent consideration liability	657	1,423
Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member]
Balance for contingent consideration	2,253	823	[1]
Settlement of contingent consideration	(1,500)
Adjustments charged to expense	657	1,423
Impact of currency exchange	77	7
Balance for contingent consideration	1,487	2,253		$ 823	[1]
Settlement of contingent consideration	(1,500)
Adjustment to contingent consideration liability	657	1,423
Impact of currency exchange	$ 77	$ 7

[1] Value recorded on inception of the liability as of the acquisition date.