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Short Term Borrowings and Long Term Debt (Long-term Debt) (Details) - USD ($)
Jun. 30, 2021
Jun. 30, 2020
Apr. 30, 2019
Debt Instrument [Line Items]      
Current portion of long-term debt $ 7,843,000 $ 7,839,000  
Long-term debt, excluding current maturities 135,331,000 143,175,000  
Borrowings under revolving credit facility 0 67,714,000  
Total debt 143,174,000 218,728,000  
Discontinued Operations, Held-for-sale      
Debt Instrument [Line Items]      
Borrowings under revolving credit facility 0 24,704,000  
Senior secured term loan facility, net of current portion      
Debt Instrument [Line Items]      
Long-term debt, excluding current maturities 131,250,000 138,750,000 $ 150,000,000
Multi-Currency Revolving Credit Facility      
Debt Instrument [Line Items]      
Borrowings under revolving credit facility 0 67,714,000  
Multi-Currency Revolving Credit Facility | Discontinued Operations, Held-for-sale      
Debt Instrument [Line Items]      
Borrowings under revolving credit facility   24,700,000  
Mississippi revenue bond, net of current portion      
Debt Instrument [Line Items]      
Long-term debt, excluding current maturities $ 4,081,000 $ 4,425,000