Industry Segments - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 31,011	$ 32,422	$ 93,745	$ 92,904
Operating income\(loss)	2,956	3,239	8,280	7,699
Capital expenditures	949	222	3,655	837
Depreciation and amortization	788	1,000	2,389	3,170
Earnings\(loss) before income taxes	4,290	3,331	9,588	9,158
Supply Chain Management
Segment Reporting Information [Line Items]
Revenues	26,952	26,061	79,886	75,692
Operating income\(loss)	7,763	7,458	22,587	19,531
Capital expenditures	14	57	1,604	672
Depreciation and amortization	675	907	2,042	2,889
Earnings\(loss) before income taxes	8,094	7,458	22,695	19,377
IT Consulting
Segment Reporting Information [Line Items]
Revenues	3,584	5,842	12,258	15,544
Operating income\(loss)	211	506	643	1,005
Capital expenditures	0	0	0	0
Depreciation and amortization	0	0	0	0
Earnings\(loss) before income taxes	211	506	643	1,005
Other
Segment Reporting Information [Line Items]
Revenues	475	519	1,601	1,668
Operating income\(loss)	(5,018)	(4,725)	(14,950)	(12,837)
Capital expenditures	935	165	2,051	165
Depreciation and amortization	113	93	347	281
Earnings\(loss) before income taxes	$ (4,015)	$ (4,633)	$ (13,750)	$ (11,224)