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Goodwill (Tables)
 12 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
The changes to goodwill during the years ended September 30, 2018 and 2017 are summarized as follows:
 
 
 
Contract
 
 
 
 
 
 
 
 
 
Research
 
 
Optics
 
 
Total
 
Goodwill at September 30, 2016
 
$
4,939,000
 
 
$
959,000
 
 
$
5,898,000
 
Currency translation on Hilger Crystals
 
 
-
 
 
 
42,000
 
 
 
42,000
 
Goodwill at September 30, 2017
 
$
4,939,000
 
 
$
1,001,000
 
 
$
5,940,000
 
Currency translation on Hilger Crystals
 
 
-
 
 
 
(40,000
)
 
 
(40,000
)
Goodwill at September 30, 2018
 
$
4,939,000
 
 
$
961,000
 
 
$
5,900,000