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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)