Annual report pursuant to Section 13 and 15(d)

3. Summary of Significant Accounting Policies (Details Narrative)

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3. Summary of Significant Accounting Policies (Details Narrative) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Allowance for doubtful accounts $ 125,000 $ 1,028,000
Allowance for sales discounts, rebates, distributor fees and returns 1,488,000 1,230,000
Inventory reserves 223,000 600,000
Transfers in or out of Level 3 0 0
Asset impairment charges 0 0
Research and development expenses 555,000 1,339,000
Advertising costs 41,000 35,000
Revenues 18,629,000 17,928,000
Foreign currency translation adjustment 1,031,000 (1,261,000)
Foreign currency transaction loss (690,000)  
Foreign currency transaction gain   306,000
Accumulated other comprehensive loss (4,579,000) (5,610,000)
Shipping and Handling [Member]    
Revenues $ 37,000 $ 57,000
Revenues [Member] | First Customer [Member] | Customer Concentration Risk [Member]    
Significant customer concentration 32.00% 15.00%
Revenues [Member] | Second Customer [Member] | Customer Concentration Risk [Member]    
Significant customer concentration 15.00% 11.00%