OTHER INTANGIBLE ASSETS, NET (Summary of Components and Changes in Other Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 8,367	$ 8,338
Accumulated Amortization	(6,273)	(6,122)
Intangible Assets, Net	2,094	2,216
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,791	2,766
Accumulated Amortization	(1,787)	(1,700)
Intangible Assets, Net	1,004	1,066
Licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	58	58
Accumulated Amortization	(58)	(58)
Intangible Assets, Net	0	0
Trade name and trademarks (indefinite lived)
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,018	1,014
Accumulated Amortization	0	0
Intangible Assets, Net	1,018	1,014
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,600	3,600
Accumulated Amortization	(3,571)	(3,545)
Intangible Assets, Net	29	55
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	900	900
Accumulated Amortization	(857)	(819)
Intangible Assets, Net	$ 43	$ 81