Industry Segments - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 31,438	$ 31,211	$ 62,734	$ 60,482
Operating income\(loss)	2,767	2,687	5,324	4,460
Capital expenditures	1,134	313	2,706	615
Depreciation and amortization	833	1,039	1,601	2,170
Earnings\(loss) before income taxes	2,622	3,617	5,298	5,827
Supply Chain Management
Segment Reporting Information [Line Items]
Revenues	26,752	25,380	52,934	49,631
Operating income\(loss)	7,646	6,718	14,825	12,073
Capital expenditures	151	313	1,590	615
Depreciation and amortization	714	948	1,367	1,982
Earnings\(loss) before income taxes	7,572	6,657	14,601	11,919
IT Consulting
Segment Reporting Information [Line Items]
Revenues	4,159	5,226	8,674	9,702
Operating income\(loss)	217	336	432	499
Capital expenditures	0	0	0	0
Depreciation and amortization	0	0	0	0
Earnings\(loss) before income taxes	217	336	433	499
Other
Segment Reporting Information [Line Items]
Revenues	527	605	1,126	1,149
Operating income\(loss)	(5,096)	(4,367)	(9,933)	(8,112)
Capital expenditures	983	0	1,116	0
Depreciation and amortization	119	91	234	188
Earnings\(loss) before income taxes	$ (5,167)	$ (3,376)	$ (9,736)	$ (6,591)