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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Nov. 30, 2022
Aug. 31, 2022
Nov. 30, 2021
Debt Instrument [Line Items]      
Total debt $ 115,876 $ 115,931 $ 116,096
Less current portion (223) (222) (219)
Less unamortized debt issuance costs (356) (368) (406)
Total long-term debt 115,297 115,341 115,471
Elecsys Series 2006A Bonds [Member]      
Debt Instrument [Line Items]      
Total debt 876 931 1,096
Series A Senior Notes [Member]      
Debt Instrument [Line Items]      
Total debt $ 115,000 $ 115,000 $ 115,000