Loans Payable And Long-Term Debt (Schedule Of Debt Maturities)(Details) (USD $)	Apr. 30, 2013	Apr. 30, 2012
Debt Instrument [Line Items]
2014	$ 1,155,000
2015	1,205,000
2016	11,247,000
2017	1,174,000
2018	2,600,000
2019 and thereafter	7,368,000
Total outstanding	24,749,000
Less current maturities	1,155,000	875,000
Total long-term debt	23,594,000	23,790,000
Revolving Credit [Member]
Debt Instrument [Line Items]
2014	0
2015	0
2016	10,000,000
2017	0
2018	0
2019 and thereafter	0
Total outstanding	10,000,000
Economic [Member]
Debt Instrument [Line Items]
2014	0
2015	0
2016	0
2017	0
2018	0
2019 and thereafter	3,480,000
Total outstanding	3,480,000
Term Loans [Member]
Debt Instrument [Line Items]
2014	349,000
2015	370,000
2016	393,000
2017	411,000
2018	2,007,000
2019 and thereafter	0
Total outstanding	3,530,000
Capital Lease [Member]
Debt Instrument [Line Items]
2014	806,000
2015	835,000
2016	854,000
2017	763,000
2018	593,000
2019 and thereafter	3,888,000
Total outstanding	$ 7,739,000