The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Intangibles (Details) - USD ($)	3 Months Ended	12 Months Ended
Intangibles (Details) - USD ($)	Oct. 31, 2017	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Intangibles
Amortization expense		$ 2,822,000	$ 357,000	$ 296,000
Altoy
Intangibles
Impairment loss	$ 899,000
Weighted average
Intangibles
Weighted average amortization period		4 years	1 year