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Loans Payable and Long-Term Debt (Schedule Of Debt Maturities) (Details) - USD ($)
$ in Thousands
Apr. 30, 2015
Apr. 30, 2014
Debt Instrument [Line Items]    
2016 $ 1,457  
2017 1,406  
2018 1,086  
2019 12,915  
2020 1,895  
2021 and thereafter 4,196  
Total 22,955  
Less current maturities 1,457 $ 1,146
Total long-term debt 21,498 $ 20,453
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
2016 0  
2017 0  
2018 0  
2019 10,000  
2020 0  
2021 and thereafter 0  
Total 10,000  
Economic Development Loans [Member]    
Debt Instrument [Line Items]    
2016 0  
2017 0  
2018 0  
2019 2,190  
2020 1,290  
2021 and thereafter 1,500  
Total 4,980  
Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
2016 1,457  
2017 1,406  
2018 1,086  
2019 726  
2020 604  
2021 and thereafter 2,696  
Total $ 7,975