4. BALANCE SHEET DETAIL - Intangible assets (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
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| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | $ 4,890,000 | $ 4,890,000 | |
| Accumulated Amortization | (3,801,000) | (3,567,000) | |
| Total | 1,089,000 | 1,323,000 | |
| Amortization of intangible assets | 234,000 | 233,000 | $ 234,000 |
| Product Designs | |||
| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | 590,000 | 590,000 | |
| Accumulated Amortization | (590,000) | (590,000) | |
| Patents | |||
| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | 4,220,000 | 4,220,000 | |
| Accumulated Amortization | (3,131,000) | (2,897,000) | |
| Total | 1,089,000 | 1,323,000 | |
| Software. | |||
| Finite-Lived Intangible Assets [Line Items] | |||
| Gross Carrying Amount | 80,000 | 80,000 | |
| Accumulated Amortization | $ (80,000) | $ (80,000) | |
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- 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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