3. BALANCE SHEET DETAIL - Intangible assets (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Gross Carrying Amount	$ 4,890,000		$ 4,890,000		$ 4,890,000
Accumulated Amortization	(1,744,000)		(1,744,000)		(1,588,000)
Total	3,146,000		3,146,000		3,302,000
Amortization of intangible assets	78,000	$ 92,000	156,000	$ 192,000
Product designs
Gross Carrying Amount	590,000		590,000		590,000
Accumulated Amortization	(590,000)		(590,000)		(590,000)
Patents
Gross Carrying Amount	4,220,000		4,220,000		4,220,000
Accumulated Amortization	(1,074,000)		(1,074,000)		(918,000)
Total	3,146,000		3,146,000		3,302,000
Software.
Gross Carrying Amount	80,000		80,000		80,000
Accumulated Amortization	$ (80,000)		$ (80,000)		$ (80,000)