Income Taxes (Provision (Benefit) For Income Taxes After Applying The Statutory U.S. Federal Income Tax Rate) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Income Taxes [Abstract]
Computed tax expense (benefit) at statutory rate	$ 277	$ (5,613)	$ (5,795)
Change in valuation allowance for deferred tax assets	(88)	(1,752)	1,105
Stock-based compensation	182	297	259
Impairment			3,806
Change in fair value of warrants	(124)	(358)	(176)
Foreign operations	(3)	(4)	852
Net operating loss carryforward limitation	(235)	7,352
Foreign taxes	125	(377)
Foreign tax credits	(70)	(39)
Other	218	647	4
Income Tax Expense (Benefit), Total	$ 282	$ 153	$ 55

Income Tax Reconciliation, Change In Fair Value Of Warrants

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Income Tax Reconciliation Foreign Operations

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Income Tax Reconciliation Net Operating Loss Carryforward Limitation

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The sum of foreign current income tax expense or benefit and foreign deferred income tax expense or benefit pertaining to Income or Loss from continuing foreign operations.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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-Name Accounting Standards Codification

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to nondeductible impairment losses under enacted tax laws.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to differences in the deductibility of incentive stock options and other equity-based compensation costs in accordance with generally accepted accounting principles and enacted tax laws.

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The sum of other amounts reflected in the reconciliation of the statutory tax provision (benefit) to the actual tax provision (benefit).

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to foreign tax credits generated or utilized under enacted tax laws during the period.

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