Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Amount of liabilities assumed at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Note 6 - Acquisitions (Details Textual) - USD ($) $ in Thousands			6 Months Ended
	Oct. 01, 2017	Apr. 16, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High			$ 2,300
Payments to Acquire Businesses, Gross			$ 300	$ 300
RAF Services, Inc [Member]
Business Combination, Consideration Transferred, Total		$ 133
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Total		$ 123
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High					$ 10
PSR Engineering Solutions d.o.o. Beograd (Voždovac) [Member]
Business Combination, Consideration Transferred, Total	$ 3,248
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	1,763
Payments to Acquire Businesses, Gross	1,000
Business Combination, Consideration Transferred, Liabilities Incurred	485
Cash Acquired from Acquisition	237
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total	$ 58