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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