Note 2 - Discontinued Operations (Details Textual) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Broadcast Microwave Services, Inc. (“BMS”) [Member]
Proceeds from Divestiture of Businesses	$ 4,900
Disposal Group, Including Discontinued Operation, Contingent Consideration	$ 2,500		$ 2,500
Proceeds from Divestiture of Businesses			$ 5,339
Contingent Consideration Receivable, Fair Value		$ 400