Industry Segments - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 31,211	$ 27,881	$ 60,482	$ 55,159
Operating income\(loss)	2,687	631	4,460	1,516
Capital expenditures	313	45	615	163
Capitalized software	0	126	0	371
Depreciation and amortization	1,039	1,514	2,170	3,194
Earnings\(loss) before income taxes	3,617	589	5,827	2,806
Supply Chain Management
Segment Reporting Information [Line Items]
Revenues	25,380	22,297	49,631	44,033
Operating income\(loss)	6,718	3,983	12,073	8,087
Capital expenditures	313	45	615	84
Capitalized software	0	126	0	371
Depreciation and amortization	948	1,415	1,982	3,001
Earnings\(loss) before income taxes	6,657	3,845	11,919	8,220
IT Consulting
Segment Reporting Information [Line Items]
Revenues	5,226	5,033	9,702	10,059
Operating income\(loss)	336	103	499	209
Capital expenditures	0	0	0	0
Capitalized software	0	0	0	0
Depreciation and amortization	0	0	0	1
Earnings\(loss) before income taxes	336	103	499	207
Other
Segment Reporting Information [Line Items]
Revenues	605	551	1,149	1,067
Operating income\(loss)	(4,367)	(3,455)	(8,112)	(6,780)
Capital expenditures	0	0	0	79
Capitalized software	0	0	0	0
Depreciation and amortization	91	99	188	192
Earnings\(loss) before income taxes	$ (3,376)	$ (3,359)	$ (6,591)	$ (5,621)