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 ($)	12 Months Ended
Intangibles (Details) - USD ($)	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Intangibles
Intangibles, net	$ 1,407,000
Amortization expense	$ 139,000	$ 80,000	$ 249,000
Weighted average
Intangibles
Weighted average amortization period	6 years	4 years
Exclusive distribution license \| SG&A
Intangibles
Impairment charge			$ 438,000
Licenses \| Other assets, long-term
Intangibles
Intangibles, gross	$ 818,000	$ 818,000
Less accumulated amortization	(658,000)	(518,000)
Intangibles, net	1,823,000	$ 300,000
Customer relationships \| Other assets, long-term
Intangibles
Intangibles, gross	1,600,000
Trademarks and tradenames \| Other assets, long-term
Intangibles
Intangibles, gross	60,000
Other \| Other assets, long-term
Intangibles
Intangibles, gross	$ 3,000