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Patents (Tables)
 9 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Patents consist of the following:
 
 
 
As of March 31,
 
As of June 30,
 
 
 
2017
 
2016
 
 
 
 
 
 
 
Patents
 
$
880,000
 
$
880,000
 
Less accumulated amortization
 
 
(602,000)
 
 
(583,000)
 
Patents, net
 
$
278,000
 
$
297,000
 
Finite-lived Intangible Assets Amortization Expense [Table Text Block]
The amortization expense was as follows:
 
 
 
Three Months Ended March 31,
 
Nine Months Ended March 31,
 
 
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amortization expense
 
$
6,000
 
$
18,000
 
$
19,000
 
$
53,000