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Note 10 - Income Taxes
3 Months Ended
Jul. 31, 2015
Notes to Financial Statements  
Income Tax Disclosure [Text Block]
(10) Income Taxes
 
The Company did not recognize any consolidated income tax benefit (expense) for the three month periods ended July 31, 2015 and 2014. The Company has recorded a valuation allowance to reduce its net deferred tax asset to an amount that is more likely than not to be realized in future years. Accordingly, the benefit of the net operating loss that would have been recognized was offset by changes in the valuation allowance.
 
During the three months ended July 31, 2015, the Company had no material changes in uncertain tax positions.