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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
Nov. 30, 2020
May 31, 2020
Current Assets:    
Cash and cash equivalents $ 5,683,787 $ 8,641,027
Accounts receivable, less allowance for doubtful accounts of $481,142 and $70,981 as of November 30, 2020 and May 31, 2020, respectively 1,611,769 1,765,871
Inventories, net 4,198,213 2,850,836
Prepaid expenses and other 453,137 1,509,083
Total current assets 11,946,906 14,766,817
Property and equipment, net of accumulated depreciation and amortization of $1,920,217 and $1,867,643 as of November 30, 2020 and May 31, 2020, respectively 288,370 279,379
Right of use assets, net of accumulated amortization of $346,514 and $231,489 as of November 30, 2020 and May 31, 2020, respectively 1,596,485 1,711,510
Investments 165,324 165,324
Intangible assets, net of accumulated amortization of $513,367 and $496,124 as of November 30, 2020 and May 31, 2020, respectively 218,331 168,655
Other assets 262,278 168,193
Total Assets 14,477,694 17,259,878
Current Liabilities:    
Accounts payable and accrued expenses 1,258,097 986,711
Accrued compensation 392,006 278,627
Lease liability, current portion 223,920 211,809
Total current liabilities 1,874,023 1,477,147
Lease liability, net of current portion 1,454,890 1,569,678
Total Liabilities 3,328,913 3,046,825
Commitments and contingencies (Notes 5 and 6)
Shareholders' Equity:    
Preferred stock, Series A 5% convertible, $0.08 par value, 571,429 shares authorized, 321,429 issued and outstanding at November 30, 2020 and May 31, 2020 and Preferred stock, undesignated, no par value, 4,428,571 shares authorized, none issued and outstanding at November 30, 2020 and May 31, 2020 25,714 25,714
Common stock, $0.08 par value, 25,000,000 shares authorized, 11,770,089 and 11,740,089 issued and outstanding at November 30, 2020 and May 31, 2020, respectively 941,605 939,205
Additional paid-in-capital 35,284,864 35,213,707
Accumulated other comprehensive loss (43,091) (39,841)
Accumulated deficit (25,060,311) (21,925,732)
Total Shareholders' Equity 11,148,781 14,213,053
Total Liabilities and Shareholders' Equity 14,477,694 17,259,878
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, 321,429 issued and outstanding at November 30, 2020 and May 31, 2020 and Preferred stock, undesignated, no par value, 4,428,571 shares authorized, none issued and outstanding at November 30, 2020 and May 31, 2020 25,714 25,714
Preferred Stock [Member]    
Shareholders' Equity:    
Preferred stock, Series A 5% convertible, $0.08 par value, 571,429 shares authorized, 321,429 issued and outstanding at November 30, 2020 and May 31, 2020 and Preferred stock, undesignated, no par value, 4,428,571 shares authorized, none issued and outstanding at November 30, 2020 and May 31, 2020