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Note 16 - Gain on Sale of Operating Facility (Details Textual)		3 Months Ended	12 Months Ended
	Jul. 29, 2016 USD ($) ft²	Jul. 31, 2016 USD ($)	Apr. 30, 2017 USD ($) ft²	Apr. 30, 2016 USD ($)	Apr. 30, 2015 USD ($)
Proceeds from Sale of Property, Plant, and Equipment			$ 11,555,000
Seagis Property Group LP (the "Landlord") [Member]
Area of Real Estate Property | ft²			24,110
Fulfillment and Warehouse Facility [Member]
Gain Loss on Disposition of Assets, Net of Tax		$ 5,280,000
Area of Real Estate Property | ft²	85,000
Proceeds from Sale of Property, Plant, and Equipment	$ 11,555,000

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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X

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property, net of tax.

+ References

No definition available.

+ Details

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X

- Details

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- Details

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