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Marketable Securities (Tables)
 6 Months Ended
Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Securities Including Accrued Interest Receivable
The following is a summary of the amortized cost and the fair value, including accrued interest receivable, as well as unrealized holding gains (losses) on the short-term and long-term marketable securities as of March 31, 2017 and September 30, 2016 (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
March 31, 2017:
 
 
 
 
 
 
 
Corporate securities
$
2,498

 
$
—

 
$
—

 
$
2,498

Other debt securities
47

 
—

 
—

 
47

Municipal securities
3,637

 
1

 
(5
)
 
3,633

Total marketable securities
$
6,182

 
$
1

 
$
(5
)
 
$
6,178

 
 
 
 
 
 
 
 
September 30, 2016:
 
 
 
 
 
 
 
Corporate securities
$
2,394

 
$
—

 
$
—

 
$
2,394

Other debt securities
39

 
—

 
—

 
39

Municipal securities
3,704

 
1

 
(3
)
 
3,702


$
6,137

 
$
1

 
$
(3
)
 
$
6,135
Fair Value of Marketable Securities by Contractual Maturity
The fair values of the marketable securities by contractual maturities at March 31, 2017 are presented below (in thousands):
 
Fair Value
Due in one year or less
$
1,495

Due after one year through five years
2,185

Due after ten years
2,498

Total marketable securities
$
6,178