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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Feb. 28, 2022
Aug. 31, 2021
Feb. 28, 2021
Debt Instrument [Line Items]      
Total debt $ 116,042 $ 116,148 $ 116,256
Less current portion (220) (217) (215)
Less unamortized debt issuance costs (394) (417) (442)
Total long-term debt 115,428 115,514 115,599
Elecsys Series 2006A Bonds [Member]      
Debt Instrument [Line Items]      
Total debt 1,042 1,148 1,256
Series A Senior Notes [Member]      
Debt Instrument [Line Items]      
Total debt $ 115,000 $ 115,000 $ 115,000