Industry Segments - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
Jul. 31, 2019	Jul. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 27,383	$ 27,399
Operating income (loss)	797	607
Capital expenditures	110	714
Capitalized software	1,285	884
Depreciation and amortization	2,245	1,798
Earnings (loss) before income taxes	1,322	1,360
Supply Chain Management
Segment Reporting Information [Line Items]
Revenues	22,347	21,458
Operating income (loss)	3,851	3,067
Capital expenditures	31	72
Capitalized software	1,285	884
Depreciation and amortization	2,151	1,727
Earnings (loss) before income taxes	4,036	3,049
IT Consulting
Segment Reporting Information [Line Items]
Revenues	4,378	5,357
Operating income (loss)	178	360
Capital expenditures	0	1
Capitalized software	0	0
Depreciation and amortization	2	2
Earnings (loss) before income taxes	178	360
Other
Segment Reporting Information [Line Items]
Revenues	658	584
Operating income (loss)	(3,232)	(2,820)
Capital expenditures	79	641
Capitalized software	0	0
Depreciation and amortization	92	69
Earnings (loss) before income taxes	$ (2,892)	$ (2,049)

Additions made to capitalized computer software costs during the period.

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