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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Intangibles (Details) - USD ($)	3 Months Ended	12 Months Ended
Intangibles (Details) - USD ($)	Oct. 28, 2017	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Intangibles
Intangibles, net		$ 628,000
Amortization expense		296,000	$ 139,000	$ 80,000
Impairment charge		$ (899,000)
Weighted average
Intangibles
Weighted average amortization period		3 years	6 years
SG&A
Intangibles
Impairment charge	$ (899,000)
Other assets, long term
Intangibles
Intangibles, gross		$ 1,582,000	$ 2,481,000
Less accumulated amortization		(954,000)	(658,000)
Intangibles, net		628,000	1,823,000
Licenses \| Other assets, long term
Intangibles
Intangibles, gross		818,000	818,000
Customer relationships
Intangibles
Impairment charge		(867,000)
Customer relationships \| Other assets, long term
Intangibles
Intangibles, gross		733,000	1,600,000
Trademarks and tradenames
Intangibles
Impairment charge		(32,000)
Trademarks and tradenames \| Other assets, long term
Intangibles
Intangibles, gross		28,000	60,000
Other \| Other assets, long term
Intangibles
Intangibles, gross		$ 3,000	$ 3,000