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Note 6 - Acquisitions (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2017	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Goodwill		$ 12,325	$ 11,630	$ 10,223
Payments to Acquire Businesses, Gross			$ 800
BGA, LLC [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		700
Point Comm, Inc. [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		1,100
Substation Design Services, LLC [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		1,500
Allied Health Professionals, LLC [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		100
Goodwill		695
Business Combination, Consideration Transferred		695
Allied Health Professionals, LLC [Member] \| Contingent Consideration Tied To Certain Gross Profit Targets Earned [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		140
Allied Health Professionals, LLC [Member] \| Unsecured Notes Payable [Member]
Business Combination, Consideration Transferred, Liabilities Incurred		$ 280
Allied Health Professionals, LLC [Member] \| Subsequent Event [Member]
Payments to Acquire Businesses, Gross	$ 275