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Loans Payable and Long-Term Debt (Schedule Of Debt Maturities) (Details) - USD ($)
$ in Thousands
Apr. 30, 2016
Apr. 30, 2015
Debt Instrument [Line Items]    
2017 $ 1,574  
2018 1,265  
2019 13,106  
2020 710  
2021 617  
2022 and thereafter 6,780  
Total 24,052  
Less current maturities 1,574 $ 1,457
Total long-term debt 22,478 $ 21,498
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
2017 0  
2018 0  
2019 10,000  
2020 0  
2021 0  
2022 and thereafter 0  
Total 10,000  
Economic Development Loans [Member]    
Debt Instrument [Line Items]    
2017 0  
2018 0  
2019 2,189  
2020 0  
2021 0  
2022 and thereafter 1,500  
Total 3,689  
Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
2017 1,574  
2018 1,265  
2019 917  
2020 710  
2021 617  
2022 and thereafter 2,082  
Total 7,165  
Other Long-term Debt [Member]    
Debt Instrument [Line Items]    
2017 0  
2018 0  
2019 0  
2020 0  
2021 0  
2022 and thereafter 3,198  
Total $ 3,198