Note 14 - Reportable Segments - Summarized Financial Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Apr. 01, 2017	Mar. 31, 2016
Gross revenues		$ 64,059	$ 44,905
Income before taxes		2,282	3,253
Operating Segments [Member] | INF [Member]
Gross revenues		39,126	34,287
Income before taxes		5,757	5,588
Operating Segments [Member] | BES [Member]
Gross revenues		25,967	11,580
Income before taxes		2,484	1,455
Intersegment Eliminations [Member]
Gross revenues		(1,034)	(962)
Income before taxes		8,241	7,043
Corporate, Non-Segment [Member]
Income before taxes	[1]	$ (5,959)	$ (3,790)

[1] Includes amortization of intangibles of $1,931 and $864 for the three months ended April 1, 2017 and March 31, 2016, respectively.