Note 2 - Discontinued Operations (Details Textual) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
Jun. 27, 2015	Sep. 24, 2016	Sep. 26, 2015
Broadcast Microwave Services, Inc. (“BMS”) [Member]
Proceeds from Divestiture of Businesses	$ 4,900
Disposal Group, Including Discontinued Operation, Contingent Consideration	$ 2,500
Proceeds from Divestiture of Businesses			$ 5,339
Contingent Consideration Receivable, Fair Value		$ 500

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration