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Credit Arrangements (Narrative) (Details) - USD ($)
 12 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Debt Instrument [Line Items]    
Long-term Debt $ 115,263,000 $ 115,492,000
Elecsys Series 2006A Bonds [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 263,000 492,000
Maturity date Sep. 01, 2026  
Variable interest rate 0.45%  
Effective interest rate 2.06%  
Interest rate adjustment period 5 years  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Maturity date Aug. 26, 2030  
Unsecured revolving line of credit, amount outstanding $ 0 0
Line of Credit Facility, Remaining Borrowing Capacity 50,000,000  
Line of credit facility, additional borrowing capacity $ 50,000,000  
Variable interest rate 5.69%  
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember  
Annual commitment fee 0.125%  
Revolving Credit Facility [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Variable interest rate 100.00%  
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember  
Annual commitment fee 0.125%  
Revolving Credit Facility [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Unsecured revolving line of credit, maximum borrowing capacity outstanding $ 50,000,000  
Variable interest rate 210.00%  
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember  
Annual commitment fee 0.20%  
Unsecured Senior Notes, Series A [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 115,000,000 $ 115,000,000
Face amount $ 115,000,000  
Maturity date Feb. 19, 2030  
Interest rate 3.82%