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Statements of Operations - Interest Expense and Depreciation and Amortization (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Interest expense, net        
Amortization of debt issuance costs $ 220 $ 221 $ 441 $ 442
Other 59 155 126 288
Interest expense 3,476 3,937 6,585 7,770
Interest income (262) (505) (561) (984)
Interest expense, net 3,214 3,432 6,024 6,786
Depreciation and amortization        
Depreciation of property, plant and equipment 5,885 5,840 11,716 11,571
Amortization of intangible assets 2,203 2,296 4,408 4,334
Amortization of other assets   12 0 24
Depreciation and amortization 8,088 8,148 16,124 15,929
Term Loan        
Interest expense, net        
Interest expense 2,064 2,031 3,939 4,079
Revolving credit facility (the "Revolver")        
Interest expense, net        
Interest expense $ 1,133 $ 1,530 $ 2,079 $ 2,961