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4. BALANCE SHEET DETAIL - Intangible assets (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | $ 4,890,000 |  | $ 4,890,000 |  | $ 4,890,000
Accumulated Amortization | (3,684,000) |  | (3,684,000) |  | (3,567,000)
Total | 1,206,000 |  | 1,206,000 |  | 1,323,000
Amortization of intangible assets | 58,000 | $ 58,000 | 117,000 | $ 116,000 |
Product Designs |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 590,000 |  | 590,000 |  | 590,000
Accumulated Amortization | (590,000) |  | (590,000) |  | (590,000)
Patents |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 4,220,000 |  | 4,220,000 |  | 4,220,000
Accumulated Amortization | (3,014,000) |  | (3,014,000) |  | (2,897,000)
Total | 1,206,000 |  | 1,206,000 |  | 1,323,000
Software. |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 80,000 |  | 80,000 |  | 80,000
Accumulated Amortization | $ (80,000) |  | $ (80,000) |  | $ (80,000)

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