Equipment, Furniture and Fixtures (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014
Property, Plant and Equipment [Line Items]
Gross equipment, furniture and fixtures	$ 2,810	$ 2,785
Accumulated depreciation and amortization	(2,221)	(2,173)
Net equipment, furniture and fixtures	589	612	[1]
Plant and Machinery [Member]
Property, Plant and Equipment [Line Items]
Gross equipment, furniture and fixtures	690	662
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross equipment, furniture and fixtures	1,803	1,741
Leasehold Improvement [Member]
Property, Plant and Equipment [Line Items]
Gross equipment, furniture and fixtures	201	201
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross equipment, furniture and fixtures	96	96
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Gross equipment, furniture and fixtures	$ 20	$ 85

[1] Derived from the consolidated audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended April 30, 2014 filed with the SEC.