Annual report pursuant to Section 13 and 15(d)

Investments in Debt Securities (Narrative) (Details)

v3.22.2.2
Investments in Debt Securities (Narrative) (Details) - USD ($)
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Amortization of premiums on debt securities $ 312,000 $ 216,000
Minimum [Member]    
Debt securities, interest rate 0.25%  
Debt securities, maturity date Aug. 31, 2022  
Maximum [Member]    
Debt securities, interest rate 3.50%  
Debt securities, maturity date Feb. 28, 2024