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Investment Securities (Schedule of Contractual Maturities) (Details) - USD ($)
Dec. 31, 2018
Jun. 30, 2018
Contractual maturities of available-for-sale securities    
Less than One Year $ 5,496,025 $ 10,967,300
One to Five Years 292,120 553,406
Fair Value $ 5,788,145 $ 11,520,706