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Note 6 - Net Income Per Share (Details) (Employee Stock Option [Member])	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Employee Stock Option [Member]
Note 6 - Net Income Per Share (Details) [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	120,750	259,250

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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