Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	May 31, 2024	Aug. 31, 2023	May 31, 2023
Debt Instrument [Line Items]
Total debt	$ 115,540	$ 115,710	$ 115,766
Less current portion	(229)	(226)	(225)
Less unamortized debt issuance costs	(282)	(320)	(332)
Total long-term debt	115,029	115,164	115,209
Elecsys Series 2006A Bonds [Member]
Debt Instrument [Line Items]
Total debt	540	710	766
Series A Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	$ 115,000	$ 115,000	$ 115,000