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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)