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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
May 31, 2023
Aug. 31, 2022
May 31, 2022
Debt Instrument [Line Items]      
Total debt $ 115,766 $ 115,931 $ 115,985
Less current portion (225) (222) (221)
Less unamortized debt issuance costs (332) (368) (380)
Total long-term debt 115,209 115,341 115,384
Elecsys Series 2006A Bonds [Member]      
Debt Instrument [Line Items]      
Total debt 766 931 985
Series A Senior Notes [Member]      
Debt Instrument [Line Items]      
Total debt $ 115,000 $ 115,000 $ 115,000