CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2022	Apr. 30, 2021
Statement Of Financial Position [Abstract]
Allowance for credit losses	$ 129	$ 119
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, authorized	20,000,000	20,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, authorized	100,000,000	100,000,000
Common stock, issued	14,240,290	14,059,440
Common stock, outstanding	13,403,326	14,059,440
Treasury stock, shares	836,964