Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)	Aug. 31, 2020	May 31, 2020
Allowance for doubtful accounts related to accounts receivable (in Dollars)	$ 181,000	$ 181,000
Equipment and leasehold improvements, net of accumulated depreciation and amortization (in Dollars)	$ 279,070	$ 276,673
Preferred stock par value (in Dollars per share)	$ 1	$ 1
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued
Common stock par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	12,500,000	12,500,000
Common stock, shares issued	3,114,163	1,962,062
Common stock, shares outstanding	3,114,163	1,962,062
Treasury stock, shares	1,152,101	1,152,101
Class A Preferred Stock
Preferred stock, shares authorized	30,000	0
Preferred stock, shares issued