CONSOLIDATED BALANCE SHEETS - USD ($)	May 31, 2022	May 31, 2021
Current Assets:
Cash and cash equivalents	$ 5,916,983	$ 4,199,311
Accounts receivable, less allowance for doubtful accounts of $153,231 and $837,415 as of May 31, 2022 and 2021, respectively	773,818	1,455,051
Inventories, net	2,416,447	3,206,255
Prepaid expenses and other	320,283	370,290
Total current assets	9,427,531	9,230,907
Property and equipment, net of accumulated depreciation and amortization of $1,305,360 and $1,972,357 as of May 31, 2022 and 2021, respectively	214,487	310,520
Right of use assets, net of accumulated amortization of $724,802 and $469,077 as of May 31, 2022 and 2021, respectively	1,301,834	1,553,081
Investments	165,324	165,324
Intangible assets, net of accumulated amortization of $18,994 and $126,769 as of May 31, 2022 and 2021, respectively	169,516	294,830
Other assets	95,588	264,151
Total Assets	11,374,280	11,818,813
Current Liabilities:
Accounts payable and accrued expenses	972,372	583,380
Accrued compensation	646,944	388,896
Advance from customers	50,670
Lease liability, current portion	341,296	327,944
Total current liabilities	2,011,282	1,300,220
Lease liability, net of current portion	1,038,284	1,291,570
Total Liabilities	3,049,566	2,591,790
Commitments and contingencies (Notes 6 and 9)
Shareholders' Equity:
Preferred stock, Series A 5% convertible, $0.08 par value, 571,429 shares authorized, none issued and outstanding as of May 31, 2022 and 2021
Preferred stock, undesignated, no par value, 4,428,571 shares authorized, none issued and outstanding as of May 31, 2022 and 2021
Common stock, $0.08 par value, 25,000,000 shares authorized, 12,867,924 and 12,307,157 issued and outstanding at May 31, 2022 and 2021, respectively	1,029,432	984,571
Additional paid-in-capital	42,446,597	38,836,743
Accumulated other comprehensive loss	(73,936)	(47,956)
Accumulated deficit	(35,077,379)	(30,546,335)
Total Shareholders' Equity	8,324,714	9,227,023
Total Liabilities and Shareholders' Equity	11,374,280	11,818,813
5% Convertible Preferred Stock [Member] | Series A Preferred Stock [Member]
Shareholders' Equity:
Preferred stock, Series A 5% convertible, $0.08 par value, 571,429 shares authorized, none issued and outstanding as of May 31, 2022 and 2021
Preferred stock, undesignated, no par value, 4,428,571 shares authorized, none issued and outstanding as of May 31, 2022 and 2021