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4. BALANCE SHEET DETAIL - Intangible assets (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Gross Carrying Amount | $ 4,890,000 | $ 4,890,000 |
Accumulated Amortization | (3,567,000) | (3,334,000) |
Total | 1,323,000 | 1,556,000 |
Amortization of intangible assets | 233,000 | 234,000 | $ 233,000
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 | (2,897,000) | (2,664,000) |
Total | 1,323,000 | 1,556,000 |
Software. |  |  |
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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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