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Investments (Amortized Cost and Fair Value of Held to Maturity Investments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 1,691 $ 29,805
Gross Unrealized Gains 0 17
Gross Unrealized Losses 0 (11)
Estimated Fair Market Value 1,691 29,811
Municipal bonds, due in less than 1 year    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 744 13,117
Gross Unrealized Gains 0 14
Gross Unrealized Losses 0 (1)
Estimated Fair Market Value 744 13,130
Corporate bonds, due in less than 1 year    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 200 11,402
Gross Unrealized Gains 0 1
Gross Unrealized Losses 0 (10)
Estimated Fair Market Value 200 11,393
Certificates of deposit, due in less than 1 year    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 747 3,567
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Market Value $ 747 3,567
Municipal bonds, due in 1 - 2 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   771
Gross Unrealized Gains   2
Gross Unrealized Losses   0
Estimated Fair Market Value   773
Corporate bonds due In 1 - 2 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   201
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Estimated Fair Market Value   201
Certificates of deposit, due in 1- 2 years    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   747
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Estimated Fair Market Value   $ 747