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Short-Term Borrowings and Long-Term Debt (Schedule of Debt) (Details) - USD ($)
Dec. 31, 2021
Jun. 30, 2021
Apr. 30, 2019
Debt Instrument [Line Items]      
Current portion of long-term debt $ 9,723,000 $ 7,843,000  
Long-term debt 129,358,000 135,331,000  
Borrowings under revolving credit facility 57,785,000 0  
Total debt 196,866,000 143,174,000  
Term Loan Facility      
Debt Instrument [Line Items]      
Long-term debt 125,625,000 131,250,000 $ 150,000,000
Multi-Currency Revolving Credit Facility      
Debt Instrument [Line Items]      
Borrowings under revolving credit facility 57,785,000 0  
Mississippi Revenue Bond      
Debt Instrument [Line Items]      
Long-term debt $ 3,733,000 $ 4,081,000