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Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2018
Fair Value Measurements [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
The following assumptions were used to estimate the fair value of the Warrants:
 
2018

 
2017

 
2016

 
 
 
 
 
 
Volatility (Percent)
31

 
37

 
63

Risk-free interest rate (Percent)
2.91

 
1.81

 
1.25

Expected term (Years)
3.5

 
4.5

 
5.5

Estimated fair value (Dollars)
0.30

 
0.26

 
1.96