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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	May 31, 2021	Aug. 31, 2020	May 31, 2020
Debt Instrument [Line Items]
Total debt	$ 116,203	$ 116,344	$ 116,397
Less current portion	(216)	(195)	(195)
Less unamortized debt issuance costs	(430)	(467)	(479)
Total long-term debt	115,557	115,682	115,723
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	0	0	0
Elecsys Series 2006A Bonds [Member]
Debt Instrument [Line Items]
Total debt	1,203	1,344	1,397
Series A Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	$ 115,000	$ 115,000	$ 115,000

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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