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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands | May 31, 2022 | Aug. 31, 2021 | May 31, 2021
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total debt | $ 115,985 | $ 116,148 | $ 116,203
Less current portion | (221) | (217) | (216)
Less unamortized debt issuance costs | (380) | (417) | (430)
Total long-term debt | 115,384 | 115,514 | 115,557
Elecsys Series 2006A Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | 985 | 1,148 | 1,203
Series A Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 115,000 | $ 115,000 | $ 115,000

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