Earnings Per Common Share - Diluted Earnings per Share for Class A Common Shares Using If-Converted Method (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Basic weighted average common shares outstanding (in shares)		34,071	33,720	34,113	33,688
Class A common shares diluted (in shares)		34,094	34,072	34,127	34,040
Basic EPS (in usd per share)	[1]	$ 0.07	$ 0.06	$ 0.15	$ 0.12
Diluted EPS (in usd per share)	[1]	$ 0.07	$ 0.06	$ 0.15	$ 0.12
Class A Common Shares
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Undistributed and distributed earnings		$ 2,237	$ 1,992	$ 4,838	$ 3,945
Undistributed and distributed earnings, class B conversion		126	113	273	224
Diluted EPS, Net earnings		$ 2,363	$ 2,105	$ 5,111	$ 4,169
Basic weighted average common shares outstanding (in shares)		32,249	31,898	32,291	31,866
Common stock equivalents (in shares)		23	352	14	352
Weighted average shares including common stock equivalents, diluted (in shares)		32,272	32,250	32,305	32,218
Class B common share conversion (in shares)		1,822	1,822	1,822	1,822
Class A common shares diluted (in shares)		34,094	34,072	34,127	34,040
Basic EPS (in usd per share)		$ 0.07	$ 0.06	$ 0.15	$ 0.12
Diluted EPS (in usd per share)		$ 0.07	$ 0.06	$ 0.15	$ 0.12

[1] Basic per share amounts are the same for Class A and Class B shares. Diluted per share amounts for Class A shares are shown above. Diluted earnings per share for Class B shares under the two-class method are $0.07 and $0.06 for the three months ended October 31, 2023 and 2022, and $0.15 and $0.12 for the six months ended October 31, 2023 and 2022. See Note D to the condensed consolidated financial statements.