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Investment Securities (Schedule of Contractual Maturities) (Details) - USD ($)
Sep. 30, 2018
Jun. 30, 2018
Contractual maturities of available-for-sale securities    
Less than One Year $ 5,169,381 $ 10,967,300
One to Five Years 2,275,911 553,406
Fair Value $ 7,445,292 $ 11,520,706