Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	16,635,295	16,570,619
Common stock, shares outstanding	16,635,295	16,570,619
Long-term Debt and Lease Obligation, Current	$ 2,263	$ 2,264
Total long-term debt	$ 369,396	$ 506,732