Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Dec. 31, 2022	Mar. 31, 2022
Accounts Receivable, Allowance for Credit Loss, Current	$ 675,000	$ 675,000
Intangible assets, accumulated amortization	21,911	19,751
Intangible assets, accumulated amortization	$ 21,911	$ 19,751
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized (in shares)	5,000,000	5,000,000
Preferred Stock, Shares Issued (in shares)	0	0
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	0	0
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0005	$ 0.0005
Common Stock, Shares Authorized (in shares)	150,000,000	150,000,000
Common Stock, Shares, Issued (in shares)	67,588,504	67,588,504
Common Stock, Shares, Outstanding, Ending Balance (in shares)	67,588,504	67,588,504