GOODWILL AND INTANGIBLE ASSETS (Narrative) (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 30, 2013	Aug. 07, 2006	Mar. 31, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2016	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets				$ 88	$ 86	$ 176	$ 174
Other current assets				2,834		$ 2,834		$ 2,457
Deferred credit amortization period						4 years
Gains in other income				507	$ 507	$ 1,015	1,015
General Electric Company
Finite Lived Intangible Assets [Line Items]
Cash received from amended supply agreement	$ 10,000
Additional amount paid on execution of agreement			$ 7,000
Acquired finite-lived intangible assets, period			3 years
Other current assets				$ 2,300		2,300
Deferred credit									$ 8,100
General Electric Company | Other Income
Finite Lived Intangible Assets [Line Items]
Gains in other income						$ 1,000	$ 1,000
Supply Agreement
Finite Lived Intangible Assets [Line Items]
Useful life of intangible asset		15 years