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Investment Securities (Tables)
12 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of cost, gross unrealized gains, gross unrealized losses and fair value of available-for-sale securities

The cost, gross unrealized gains, gross unrealized losses and fair value of available-for-sale securities by major security type at June 30, 2018 and 2017 are as follows:

       Gross   Gross     
   Amortized   Unrealized   Unrealized   Fair 
   Cost   Gains   Losses   Value 
2018                
Certificates of deposit  $10,440,000   $   $   $10,440,000 
Municipal bonds   1,085,754    635    (5,683)   1,080,706 
2018 Total investment securities  $11,525,754   $635   $(5,683)  $11,520,706 
2017                    
Certificates of deposit  $8,557,000   $   $   $8,557,000 
Municipal bonds   871,872    258    (2,162)   869,968 
2017 Total investment securities  $9,428,872   $258   $(2,162)  $9,426,968 
Schedule of contractual maturities of available-for-sale securities

As of June 30, 2018 and 2017, the remaining contractual maturities of available-for-sale securities were as follows:

   Years to Maturity     
   Less than   One to     
   One Year   Five Years   Total 
             
2018               
Available-for-sale  $10,967,300   $553,406   $11,520,706 
2017               
Available-for-sale  $8,829,542   $597,426   $9,426,968