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Available-for-Sale-Securities Available-for-sale Securities by Contractual Maturity (Details)
Jun. 30, 2015
USD ($)
Available-for-sale Securities [Abstract]  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis $ 0
Available-for-sale Securities, Debt Maturities, Remainder of Fiscal Year, Amortized Cost Basis 28,322,400
Available-for-sale Securities, Noncurrent 0
Amortized Cost 28,320,500
Estimated Fair Value $ 28,322,400