Industry Segments - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 31,296	$ 29,271
Operating income\(loss)	2,557	1,773
Capital expenditures	1,572	302
Depreciation and amortization	768	1,131
Earnings\(loss) before income taxes	2,676	2,210
Supply Chain Management
Segment Reporting Information [Line Items]
Revenues	26,182	24,251
Operating income\(loss)	7,179	5,356
Capital expenditures	1,439	302
Depreciation and amortization	653	1,034
Earnings\(loss) before income taxes	7,030	5,261
IT Consulting
Segment Reporting Information [Line Items]
Revenues	4,515	4,476
Operating income\(loss)	215	163
Capital expenditures	0	0
Depreciation and amortization	0	0
Earnings\(loss) before income taxes	215	163
Other
Segment Reporting Information [Line Items]
Revenues	599	544
Operating income\(loss)	(4,837)	(3,746)
Capital expenditures	133	0
Depreciation and amortization	115	97
Earnings\(loss) before income taxes	$ (4,569)	$ (3,214)