Segment Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017	May 01, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 26,271	$ 27,003	$ 28,033	$ 27,399	$ 29,363	$ 30,117	$ 26,337	$ 26,886	$ 108,706	$ 112,703	$ 106,286
Operating income	1,013	$ 2,130	$ 1,526	$ 607	2,463	$ 4,204	$ 3,242	$ 3,622	5,276	13,531	7,766
Capital expenditures									1,252	1,428	731
Capitalized Software									5,961	4,804	3,724
Depreciation and amortization									7,719	6,030	6,640
Interest income									2,092	1,575	1,257
Earnings (loss) before income taxes									7,641	15,715	21,615
Total Consolidated Assets	161,310				162,965				161,310	162,965		$ 164,856
Supply Chain Management
Segment Reporting Information [Line Items]
Total revenues									86,296	91,613	84,058
Operating income									15,967	19,580	13,103
Capital expenditures									375	263	321
Capitalized Software									5,961	4,804	3,724
Depreciation and amortization									7,372	5,827	6,173
Interest income									1,408	1,043	817
Earnings (loss) before income taxes									16,335	20,026	13,050
Total Consolidated Assets	112,604				112,881				112,604	112,881
IT Consulting
Segment Reporting Information [Line Items]
Total revenues									20,007	18,460	19,633
Operating income									964	985	890
Capital expenditures									1	10	2
Capitalized Software									0	0	0
Depreciation and amortization									7	7	7
Interest income									0	0	0
Earnings (loss) before income taxes									964	985	890
Total Consolidated Assets	4,599				5,538				4,599	5,538
Other
Segment Reporting Information [Line Items]
Total revenues									2,403	2,630	2,595
Operating income									(11,655)	(7,034)	(6,227)
Capital expenditures									876	1,155	408
Capitalized Software									0	0	0
Depreciation and amortization									340	196	460
Interest income									684	532	440
Earnings (loss) before income taxes									(9,658)	(5,296)	7,675
Total Consolidated Assets	$ 44,107				$ 44,546				44,107	44,546
Operating income/(loss) before intersegment eliminations
Segment Reporting Information [Line Items]
Operating income									5,276	13,531	7,766
Operating income/(loss) before intersegment eliminations | Supply Chain Management
Segment Reporting Information [Line Items]
Operating income									15,967	19,580	13,103
Operating income/(loss) before intersegment eliminations | IT Consulting
Segment Reporting Information [Line Items]
Operating income									964	985	890
Operating income/(loss) before intersegment eliminations | Other
Segment Reporting Information [Line Items]
Operating income									(11,655)	(7,034)	(6,227)
Intersegment eliminations
Segment Reporting Information [Line Items]
Operating income									0	0	0
Intersegment eliminations | Supply Chain Management
Segment Reporting Information [Line Items]
Operating income									0	0	0
Intersegment eliminations | IT Consulting
Segment Reporting Information [Line Items]
Operating income									0	0	0
Intersegment eliminations | Other
Segment Reporting Information [Line Items]
Operating income									$ 0	$ 0	$ 0