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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, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Interest expense, net        
Amortization of debt issuance costs $ 147 $ 220 $ 295 $ 441
Other 44 59 89 126
Interest expense 3,102 3,476 6,167 6,585
Interest income (149) (262) (325) (561)
Interest expense, net 2,953 3,214 5,842 6,024
Depreciation and amortization        
Depreciation of property, plant and equipment 5,864 5,885 11,578 11,716
Amortization of intangible assets 2,137 2,203 4,277 4,408
Depreciation and amortization 8,001 8,088 15,855 16,124
Term loan        
Interest expense, net        
Interest expense 2,264 2,064 4,537 3,939
Revolving credit facility (the "Revolver")        
Interest expense, net        
Interest expense $ 647 $ 1,133 $ 1,246 $ 2,079