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Short-Term Borrowings and Long-Term Debt (Long-term Debt) (Details) - USD ($)
Jun. 30, 2020
Jun. 30, 2019
Apr. 30, 2019
Debt Instrument [Line Items]      
Current portion of long-term debt $ 7,839,000 $ 4,085,000  
Long-term debt, excluding current maturities 143,175,000 151,014,000  
Borrowings under revolving credit facility 67,714,000 172,390,000  
Total debt 218,728,000 327,489,000  
Discontinued Operations, Held-for-sale [Member]      
Debt Instrument [Line Items]      
Borrowings under revolving credit facility 24,704,000 28,427,000  
Mississippi Revenue Bond [Member]      
Debt Instrument [Line Items]      
Long-term debt, excluding current maturities 4,425,000 4,764,000  
Term Loan Facility [Member]      
Debt Instrument [Line Items]      
Long-term debt, excluding current maturities 138,750,000 146,250,000 $ 150,000,000
Multi-Currency Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Borrowings under revolving credit facility 67,714,000 172,390,000  
Multi-Currency Revolving Credit Facility [Member] | Discontinued Operations, Held-for-sale [Member]      
Debt Instrument [Line Items]      
Borrowings under revolving credit facility $ 24,700,000 $ 28,400,000