GOODWILL AND INTANGIBLE ASSETS - Schedule of intangible assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2018	Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Original Amount	$ 5,439	$ 5,236
Accumulated Amortization	(2,016)	(1,711)
Total	$ 3,423	3,525
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	7 years
Original Amount	$ 3,007	3,007
Accumulated Amortization	(1,135)	(919)
Total	1,872	2,088
Permits
Finite-Lived Intangible Assets [Line Items]
Original Amount	1,650	1,459
Accumulated Amortization	(438)	(390)
Total	$ 1,212	1,069
Permits | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	6 years
Permits | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	15 years
Patents
Finite-Lived Intangible Assets [Line Items]
Original Amount	$ 395	383
Accumulated Amortization	(288)	(278)
Total	$ 107	105
Patents | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years
Patents | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	17 years
Trade name
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	7 years
Original Amount	$ 270	270
Accumulated Amortization	(96)	(77)
Total	$ 174	193
Non-compete
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years
Original Amount	$ 117	117
Accumulated Amortization	(59)	(47)
Total	$ 58	$ 70