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Investment Securities (Schedule of Contractual Maturities of Available-For-Sale Securities) (Details) - USD ($)
Jun. 30, 2018
Jun. 30, 2017
Years to maturity of Available-for-sale securities:    
Less than One Year $ 10,967,300 $ 8,829,542
One to Five Years 553,406 597,426
Total $ 11,520,706 $ 9,426,968