Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Apr. 30, 2013
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 15,992	$ 17,689
Capital leases, payable in monthly installments through July 2015	251	306
Less: current maturities of long-term debt obligations	(1,348)	(2,519)
Long term debt, net of current portion	14,644	15,170
Term Note A [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	12,241	7,883
Term Note B [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	1,000	4,000
Wells Fargo Revolving Line Of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 2,500	$ 5,500

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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-Publisher FASB

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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