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4. BALANCE SHEET DETAIL - Intangible assets (Details) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Gross Carrying Amount	$ 4,890,000	$ 4,890,000
Accumulated Amortization	(2,634,000)	(2,401,000)
Total	2,256,000	2,489,000
Amortization of intangible assets	233,000	233,000	$ 267,000
Product designs
Gross Carrying Amount	590,000	590,000
Accumulated Amortization	(590,000)	(590,000)
Patents
Gross Carrying Amount	4,220,000	4,220,000
Accumulated Amortization	(1,964,000)	(1,731,000)
Total	2,256,000	2,489,000
Software.
Gross Carrying Amount	80,000	80,000
Accumulated Amortization	$ (80,000)	$ (80,000)

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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