Industry Segments - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 29,168	$ 31,296
Operating income\(loss)	1,567	2,557
Capital expenditures	467	1,572
Depreciation and amortization	731	768
Earnings\(loss) before income taxes	3,454	2,676
Supply Chain Management
Segment Reporting Information [Line Items]
Revenues	25,360	26,182
Operating income\(loss)	6,442	7,179
Capital expenditures	350	1,439
Depreciation and amortization	551	653
Earnings\(loss) before income taxes	6,688	7,030
IT Consulting
Segment Reporting Information [Line Items]
Revenues	3,266	4,515
Operating income\(loss)	176	215
Capital expenditures	2	0
Depreciation and amortization	0	0
Earnings\(loss) before income taxes	178	215
Other
Segment Reporting Information [Line Items]
Revenues	542	599
Operating income\(loss)	(5,051)	(4,837)
Capital expenditures	115	133
Depreciation and amortization	180	115
Earnings\(loss) before income taxes	$ (3,412)	$ (4,569)