Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Nov. 30, 2023	Aug. 31, 2023	Nov. 30, 2022
Debt Instrument [Line Items]
Total debt	$ 115,654	$ 115,710	$ 115,876
Less current portion	(227)	(226)	(223)
Less unamortized debt issuance costs	(307)	(320)	(356)
Total long-term debt	115,120	115,164	115,297
Elecsys Series 2006A Bonds [Member]
Debt Instrument [Line Items]
Total debt	654	710	876
Series A Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	$ 115,000	$ 115,000	$ 115,000