Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Jul. 31, 2022	Apr. 30, 2022
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 100,000	$ 100,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	500,000	500,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	12,000,000	12,000,000
Common stock, shares issued	6,071,288	6,026,788
Common stock, shares outstanding	6,071,288	6,026,788