Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	May 31, 2025	Aug. 31, 2024	May 31, 2024
Debt Instrument [Line Items]
Total debt	$ 115,321	$ 115,492	$ 115,540
Less current portion	(232)	(228)	(229)
Less unamortized debt issuance costs	(233)	(270)	(282)
Total long-term debt	114,856	114,994	115,029
Elecsys Series 2006A Bonds [Member]
Debt Instrument [Line Items]
Total debt	321	492	540
Series A Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	$ 115,000	$ 115,000	$ 115,000