Note 13 - Discontinued Operations - Summary of Operating Results (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Net sales		$ 6,136	$ 1,593
Operating income		478	157
Income (loss) before taxes		(608)	157	(278)
Income tax provision		89	38
Income (loss), net of tax		(697)	119	(278)
Fixtures Services Business FSG [Member]
Loss from impairment of FSG		(1,086)
Broadcast Microwave Services, Inc. (“BMS”) [Member]
Loss from sale of BMS	[1]			$ (278)

[1] Represents the write-off of the contingent consideration receivable from the sale of Broadcast Microwave Services, Inc.