CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock
Balance at Apr. 30, 2021	$ 279,905	$ 14	$ 265,362	$ 14,529
Balance, shares at Apr. 30, 2021		14,059,000
Net income (loss)	3,457			3,457
Stock-based compensation	752		752
Proceeds from exercise of stock options	5		5
Proceeds from exercise of stock options, shares		3,000
Issuance of common stock under restricted stock unit awards, net of tax	(312)		(312)
Issuance of common stock under restricted stock unit awards, net of tax, shares		38,000
Balance at Jul. 31, 2021	283,807	$ 14	265,807	17,986
Balance, shares at Jul. 31, 2021		14,100,000
Balance at Apr. 30, 2022	$ 203,031	$ 14	268,393	(50,351)	$ (15,025)
Balance, shares at Apr. 30, 2022	13,403,326	14,240,000			837,000
Net income (loss)	$ (5,695)			(5,695)
Stock-based compensation	714		714
Issuance of common stock under restricted stock unit awards, net of tax	(252)		(252)
Issuance of common stock under restricted stock unit awards, net of tax, shares		52,000
Balance at Jul. 31, 2022	$ 197,798	$ 14	$ 268,855	$ (56,046)	$ (15,025)
Balance, shares at Jul. 31, 2022	13,454,827	14,292,000			837,000