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Selected Consolidated Financial Statement Information (Estimated Amortization of Patents) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Estimated amortization of patents and patent licenses    
2019 $ 199  
2020 193  
2021 191  
2022 181  
2023 174  
Thereafter 4,293  
Total Patents $ 5,231 $ 5,056