Annual report pursuant to Section 13 and 15(d)

Investments in Debt Securities (Narrative) (Details)

v3.21.2
Investments in Debt Securities (Narrative) (Details)
12 Months Ended
Jun. 30, 2021
USD ($)
Amortization of premiums on debt securities $ 216,000
Minimum [Member]  
Debt securities, interest rate 0.23%
Debt securities, maturity date Sep. 01, 2021
Maximum [Member]  
Debt securities, interest rate 4.25%
Debt securities, maturity date Jun. 01, 2023