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4. BALANCE SHEET DETAIL - Intangible assets (Details) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Gross Carrying Amount $ 4,890,000 $ 4,890,000  
Accumulated Amortization (2,634,000) (2,401,000)  
Total 2,256,000 2,489,000  
Amortization of intangible assets 233,000 233,000 $ 267,000
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 (1,964,000) (1,731,000)  
Total 2,256,000 2,489,000  
Software.      
Gross Carrying Amount 80,000 80,000  
Accumulated Amortization $ (80,000) $ (80,000)