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4. BALANCE SHEET DETAIL - Intangible assets (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023
Gross Carrying Amount | $ 4,890,000 |  | $ 4,890,000 |  | $ 4,890,000
Accumulated Amortization | (3,218,000) |  | (3,218,000) |  | (3,100,000)
Total | 1,672,000 |  | 1,672,000 |  | 1,790,000
Amortization of intangible assets | 58,000 | $ 59,000 | 117,000 | $ 117,000 |
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 | (2,548,000) |  | (2,548,000) |  | (2,430,000)
Total | 1,672,000 |  | 1,672,000 |  | 1,790,000
Software. |  |  |  |  |
Gross Carrying Amount | 80,000 |  | 80,000 |  | 80,000
Accumulated Amortization | $ (80,000) |  | $ (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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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