Note 2 - Summary of Operating Results (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Broadcast Microwave Services, Inc. (“BMS”) [Member]
Net sales		$ 2,344		$ 6,965
Operating loss before income taxes		(1,049)		(1,963)
Loss from sale of BMS	(55)	(2,910)	(55)	(3,010)
Loss before taxes	(55)	(3,959)	(55)	(4,973)
Income tax provision				6
Loss, net of tax	(55)	(3,959)	(55)	(4,979)
Loss, net of tax	$ (55)	$ (3,959)	$ (55)	$ (4,979)