CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Apr. 30, 2023	$ 63	$ 620,224	$ (431,118)	$ 189,169
Beginning balance, shares at Apr. 30, 2023	62,692
Common stock issued under equity compensation plans		878		878
Common stock issued under equity compensation plans, shares	419
Stock-based compensation expense		2,343		2,343
Net loss			(2,122)	(2,122)
Ending balance, value at Jul. 31, 2023	$ 63	623,445	(433,240)	190,268
Ending balance, shares at Jul. 31, 2023	63,111
Beginning balance, value at Apr. 30, 2024	$ 64	632,696	(571,871)	60,889
Beginning balance, shares at Apr. 30, 2024	63,568
Common stock issued under equity compensation plans		616		616
Common stock issued under equity compensation plans, shares	222
Stock-based compensation expense		2,665		2,665
Net loss			(5,534)	(5,534)
Ending balance, value at Jul. 31, 2024	$ 64	$ 635,977	$ (577,405)	$ 58,636
Ending balance, shares at Jul. 31, 2024	63,790