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Note 6 - Income Taxes (Details) - Effective Income Tax Rate Reconciliation	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Effective Income Tax Rate Reconciliation [Abstract]
Income taxes at the statutory rates	35.00%	35.00%	35.00%
Federal tax credits	(1.90%)	(1.70%)	(2.10%)
State income taxes, net of federal tax benefit	3.30%	2.60%	2.90%
Out of period adjustments	(1.30%)
Other	(0.20%)	0.90%	0.60%
	34.90%	36.80%	36.40%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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