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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Nov. 30, 2021
Aug. 31, 2021
Nov. 30, 2020
Debt Instrument [Line Items]      
Total debt $ 116,096 $ 116,148 $ 116,309
Less current portion (219) (217) (214)
Less unamortized debt issuance costs (406) (417) (454)
Total long-term debt 115,471 115,514 115,641
Elecsys Series 2006A Bonds [Member]      
Debt Instrument [Line Items]      
Total debt 1,096 1,148 1,309
Series A Senior Notes [Member]      
Debt Instrument [Line Items]      
Total debt $ 115,000 $ 115,000 $ 115,000