Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Jun. 30, 2021	Mar. 31, 2021
Accounts receivable, allowance for doubtful accounts	$ 50,000	$ 50,000
Property and equipment, accumulated depreciation	189,055	181,289
Operating lease right-of-use asset, accumulated depreciation	246,306	225,781
Accounts receivable, related party, allowance	250,000	250,000
Intangible assets, accumulated amortization	$ 17,591	$ 16,871
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	5,000,000	5,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0005	$ 0.0005
Common stock, authorized (in shares)	150,000,000	150,000,000
Common stock, issued (in shares)	67,588,504	67,588,504
Common stock, outstanding (in shares)	67,588,504	67,588,504