Industry Segments - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Segment Reporting Information [Line Items]
Revenue	$ 25,286	$ 25,690	$ 51,478	$ 51,591
Operating income (loss)	1,036	1,229	2,880	2,621
Capital expenditures	144	56	280	521
Depreciation and amortization	1,167	1,277	2,354	2,007
Earnings (loss) before income taxes	2,216	652	5,194	3,930
Supply Chain Management
Segment Reporting Information [Line Items]
Revenue	24,507	24,828	49,876	49,798
Operating income (loss)	6,143	5,597	12,731	11,768
Capital expenditures	20	37	27	387
Depreciation and amortization	999	1,102	2,019	1,653
Earnings (loss) before income taxes	6,720	5,617	13,835	12,034
Other
Segment Reporting Information [Line Items]
Revenue	779	862	1,602	1,793
Operating income (loss)	(5,107)	(4,368)	(9,851)	(9,147)
Capital expenditures	124	19	253	134
Depreciation and amortization	167	175	336	354
Earnings (loss) before income taxes	$ (4,504)	$ (4,965)	$ (8,641)	$ (8,104)