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Loans Payable and Long-Term Debt (Schedule Of Debt Maturities) (Details) - USD ($) $ in Thousands | Apr. 30, 2017 | Apr. 30, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
2018 | $ 1,580 |
2019 | 3,440 |
2020 | 1,064 |
2021 | 793 |
2022 | 618 |
2023 and thereafter | 9,382 |
Total | 16,877 |
Less current maturities | (1,598) | $ (1,574)
Total long-term debt | 15,279 | $ 22,145
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
2018 | 0 |
2019 | 2,189 |
2020 | 0 |
2021 | 0 |
2022 | 0 |
2023 and thereafter | 2,250 |
Total | 4,439 |
Economic Development Loans [Member] |  |
Debt Instrument [Line Items] |  |
2018 | 1,598 |
2019 | 1,268 |
2020 | 1,081 |
2021 | 810 |
2022 | 635 |
2023 and thereafter | 1,456 |
Total | 6,848 |
Capital Lease Obligations [Member] |  |
Debt Instrument [Line Items] |  |
2018 | 0 |
2019 | 0 |
2020 | 0 |
2021 | 0 |
2022 | 0 |
2023 and thereafter | 5,925 |
Total | 5,925 |
Other Long-term Debt [Member] |  |
Debt Instrument [Line Items] |  |
2018 | 18 |
2019 | 17 |
2020 | 17 |
2021 | 17 |
2022 | 17 |
2023 and thereafter | 249 |
Total | $ 335 |

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