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Provision for Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Provision for Income Taxes Current, Federal $ 0 $ 0
Provision for Income Taxes, Current, State 2 1
Provision for Income Taxes, Current, Foriegn 8 (3)
Provision for Income Taxes, Current, Total 10 (2)
Provision for Income Taxes, Deferred, Federal (2,258) (2,523)
Provision for Income Taxes, Deferred, State (196) (172)
Provision for Income Taxes, Deferred, Foreign 0 (68)
Provision for Income Taxes, Deferred, Total (2,454) (2,763)
Provision for Income Taxes, Change in valuation allowance, Federal 2,258 2,523
Provision for Income Taxes, Change in valuation allowance, State 196 172
Provision for Income Taxes, Change in valuation allowance, Foreign 0 68
Provision for Income Taxes, Change in valuation allowance, Total 2,454 2,763
Provision for Income Taxes, Total, Federal 0 0
Provision for Income Taxes, Total, State 2 1
Provision for Income Taxes, Total, Foreign 8 (3)
Provision for Income Taxes, Total $ 10 $ (2)