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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Feb. 28, 2021
Aug. 31, 2020
Feb. 29, 2020
Debt Instrument [Line Items]      
Total debt $ 116,256 $ 116,344 $ 116,467
Less current portion (215) (195) (211)
Less unamortized debt issuance costs (442) (467) (491)
Total long-term debt 115,599 115,682 115,765
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Total debt 0 0 0
Elecsys Series 2006A Bonds [Member]      
Debt Instrument [Line Items]      
Total debt 1,256 1,344 1,467
Series A Senior Notes [Member]      
Debt Instrument [Line Items]      
Total debt $ 115,000 $ 115,000 $ 115,000