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AVAILABLE-FOR-SALE-SECURITIES (Tables)
 9 Months Ended
Jun. 30, 2018
AVAILABLE FOR SALE SECURITIES [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]


Available-for-sale securities consist of the following as of June 30, 2018:

 
Amortized
Cost
  
Unrealized
Gains
  
Unrealized
Losses
  
Estimated
Fair Value
 
Available-for-sale securities:
           
            
Asset backed securities
$
13,900
  
$
1
  
$
-
  
$
13,901
 
Certificates of deposit
 
2,439
   
3
   
-
   
2,442
 
Commercial paper
 
7,756
   
-
   
(2
)
  
7,754
 
Corporate debt securities
 
75,312
   
-
   
(52
)
  
75,260
 
U.S. Treasuries
 
25,094
   
4
   
-
   
25,098
 
Total available-for-sale securities
$
124,501
   
8
  
$
(54
)
 
$
124,455
 
Investments Classified by Contractual Maturity Date [Table Text Block]
Available-for-sale securities, by contractual maturity, as of June 30, 2018 are as follows:

  
Amortized
Cost
  
Estimated Fair Value
 
Mature in one year or less
 
$
79,397
  
$
79,373
 
Mature after one year through four years
  
45,104
   
45,082
 
  
$
124,501
  
$
124,455