Equipment, Furniture and Fixtures (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Apr. 30, 2012
Property, Plant and Equipment [Line Items]
Gross equipment, furniture and fixtures	$ 2,551	$ 2,487
Accumulated depreciation and amortization	(2,046)	(2,005)
Net equipment, furniture and fixtures	505	482
Plant and machinery [Member]
Property, Plant and Equipment [Line Items]
Gross equipment, furniture and fixtures	724	724
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Gross equipment, furniture and fixtures	1,536	1,482
Leasehold improvement [Member]
Property, Plant and Equipment [Line Items]
Gross equipment, furniture and fixtures	200	190
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Gross equipment, furniture and fixtures	$ 91	$ 91

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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