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Investment Securities (Tables)
3 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-Sale Securities

Investment securities at September 30, 2018 and June 30, 2018 consist of certificates of deposit and municipal bonds which are classified as available-for-sale securities and have been determined to be level 1 assets. The cost, gross unrealized gains, gross unrealized losses and fair value of available-for-sale securities by major security type at September 30, 2018 and June 30, 2018 are as follows:

       Gross   Gross     
   Amortized   Unrealized   Unrealized   Fair 
   Cost   Gains   Losses   Value 
September 30, 2018                    
Certificates of deposit   $4,966,000   $   $   $4,966,000 
Municipal bonds   2,482,635    1,020    (4,363)   2,479,292 
Total investment securities  $7,448,635   $1,020   $(4,363)  $7,445,292 
June 30, 2018                    
Certificates of deposit  $10,440,000   $   $   $10,440,000 
Municipal bonds   1,085,754    635    (5,683)   1,080,706 
Total investment securities  $11,525,754   $635   $(5,683)  $11,520,706 
Schedule of Contractual Maturities

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

   Years to Maturity     
   Less than   One to     
   One Year   Five Years   Total 
September 30, 2018               
Available-for-sale  $5,169,381   $2,275,911   $7,445,292 
                
June 30, 2018               
Available-for-sale  $10,967,300   $553,406   $11,520,706