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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities $ 12,807 $ 17,227
Available-for-sale securities, fair value 12,807 17,227
Held-to-maturity securities, remaining maturities less than 1 year 353  
Held-to-maturity securities, remaining maturities less than 1 year, fair value 352  
Held-to-maturity securities, remaining maturities from 1-3 years 3,160 2,073
Held-to-maturity securities, remaining maturities from 1-3 years, fair value 3,166 2,057
Held-to-maturity securities, remaining maturities from 3-5 years   1,453
Held-to-maturity securities, remaining maturities from 3-5 years, fair value   1,438
Held-to-maturity securities, 1-90 days 2,243 1,496
Held-to-maturity securities, 1-90 days, fair value 2,244 1,496
Held-to-maturity securities, 91-360 days 1,699 4,438
Held-to-maturity securities, 91-360 days, fair value 1,703 4,440
Held-to-maturity securities, over 360 days 1,048 4,990
Held-to-maturity securities, over 360 days, fair value 1,050 4,993
Investments 21,310 31,677
Investments, fair value 21,322 31,651
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, fair value 12,807 17,227
Investments, fair value 12,807 17,227
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held-to-maturity securities, remaining maturities less than 1 year, fair value 352  
Held-to-maturity securities, remaining maturities from 1-3 years, fair value 3,166 2,057
Held-to-maturity securities, remaining maturities from 3-5 years, fair value   1,438
Held-to-maturity securities, 1-90 days, fair value 2,244 1,496
Held-to-maturity securities, 91-360 days, fair value 1,703 4,440
Held-to-maturity securities, over 360 days, fair value 1,050 4,993
Investments, fair value $ 8,515 $ 14,424