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Selected Consolidated Financial Statement Information (Estimated Amortization of Patents) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Jun. 30, 2016
Estimated amortization of patents and patent licenses    
2017 $ 198  
2018 190  
2019 180  
2020 180  
2021 180  
Thereafter 4,128  
Total Patents $ 5,056 $ 5,013