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Intangible Assets
 12 Months Ended
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets
Intangible assets consist of (in thousands):
 
June 30,
 
2016
 
2015
Patent costs
$
2,330

 
$
2,330

Accumulated amortization
(1,181
)
 
(1,046
)
Total definite-lived intangible assets, net
1,149

 
1,284

 
 
 
 
Trademarks and other indefinite-lived intangible assets
595

 
595

Total intangible assets, net
$
1,744

 
$
1,879


Amortization expense totaled $0.1 million, $0.1 million, and $0.1 million for the years ended June 30, 2016, 2015, and 2014, respectively. Annual estimated amortization expense is expected to approximate $0.1 million for each of the five succeeding fiscal years.