Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation)(Details) (USD $)	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Income Taxes [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Tax basis adjustment	0.00%	(1.70%)	(3.30%)
Meals and entertainment	1.50%	(0.80%)	(0.80%)
Other	1.10%	0.00%	(0.80%)
Total	2.60%	(2.50%)	(4.90%)
Effective federal income tax rate	37.60%	32.50%	30.10%
State income taxes, net of federal tax effect	4.10%	5.10%	3.10%
Effective income tax rate	41.70%	37.60%	33.20%
Income taxes paid	$ 1,219,000	$ 229,000	$ 235,000