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Credit Arrangements (Narrative) (Details)
$ in Millions
12 Months Ended
Sep. 08, 2021
USD ($)
Aug. 28, 2020
USD ($)
Jun. 30, 2024
USD ($)
Short-term Debt [Line Items]      
Letters of credit outstanding     $ 1.0
Credit Agreement [Member] | Wells Fargo Bank N.A. [Member]      
Short-term Debt [Line Items]      
Interest rate 1.50%    
Basis spread on interest rate 1.25%    
Effective interest rate     6.70%
Debt term 5 years    
Fixed coverage ratio     1
Credit Agreement [Member] | Wells Fargo Bank N.A. [Member] | Maximum [Member]      
Short-term Debt [Line Items]      
Credit agreement capacity $ 85.0    
Credit Agreement [Member] | Wells Fargo Bank N.A. [Member] | SOFR [Member] | Minimum [Member]      
Short-term Debt [Line Items]      
Basis spread on interest rate     1.36%
Credit Agreement [Member] | Wells Fargo Bank N.A. [Member] | SOFR [Member] | Maximum [Member]      
Short-term Debt [Line Items]      
Basis spread on interest rate     1.61%
Credit Agreement [Member] | Wells Fargo Bank N.A. [Member] | Letter Of Credit [Member]      
Short-term Debt [Line Items]      
Credit agreement capacity $ 5.0    
Secured Credit Agreement [Member] | Dubuque Bank and Trust Company [Member]      
Short-term Debt [Line Items]      
Credit agreement capacity   $ 25.0  
Basis spread on interest rate   1.50%  
Debt term   2 years  
Secured Credit Agreement [Member] | Dubuque Bank and Trust Company [Member] | Floor Rate [Member]      
Short-term Debt [Line Items]      
Basis spread on interest rate   3.00%  
Secured Credit Agreement [Member] | Wells Fargo Bank N.A. [Member]      
Short-term Debt [Line Items]      
Line of credit outstanding     $ 4.8