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Note 6 - Income Taxes (Details) (USD $)
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Note 6 - Income Taxes (Details) [Line Items]      
Operating Loss Carryforwards $ 74,670,000    
Deferred Tax Assets, Valuation Allowance 91,000 0  
Valuation Allowance, Deferred Tax Asset, Change in Amount 91,000 0  
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount 2,760    
Unrecognized Tax Benefits 9,244,000 8,938,000 7,538,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 6,131,000    
Unrecognized Tax Benefits, Period Increase (Decrease) 306,000    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 402,000 286,000  
Income Tax Examination, Penalties and Interest Expense 116,000 37,000  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound 2,661,000    
2010 and Forward (Member)
      
Note 6 - Income Taxes (Details) [Line Items]      
Statute of Limitations for Federal Tax Years Open 2010 and forward    
2009 and Forward [Member]
      
Note 6 - Income Taxes (Details) [Line Items]      
Statute of Limitations for Federal Tax Years Open 2009 and forward    
State Alternative Minimum Tax Credit Carryforwards [Member]
      
Note 6 - Income Taxes (Details) [Line Items]      
Tax Credit Carryforward, Amount $ 129,000