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LEGAL MATTERS (Details) $ in Thousands		1 Months Ended		9 Months Ended
	Feb. 01, 2016 USD ($) project	Jul. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Oct. 31, 2018 USD ($)
Loss Contingencies
Gain on settlement				$ 1,400
PPS Engineers, Inc. claims lawsuit
Loss Contingencies
Amount paid on settlement		$ 900
Gain on settlement				$ 1,400
Former subcontractor | GPS
Loss Contingencies
Amount of arbitration panel awarded			$ 5,200
Pending Litigation | PPS Engineers, Inc. claims lawsuit
Loss Contingencies
Amount of damages sought by plaintiff	$ 2,300
Number of significant project locations involved in the lawsuit | project	1

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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