Quarterly report pursuant to Section 13 or 15(d)

Investments in Debt and Equity Securities (Narrative) (Details)

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Investments in Debt and Equity Securities (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Jun. 30, 2021
Amortization of premiums on debt securities $ 74,000 $ 80,000 $ 269,000 $ 130,000  
Investments in equity security - at cost $ 1,760,000   $ 1,760,000   $ 0
Minimum [Member]          
Debt securities, interest rate 0.25%   0.25%    
Debt securities, maturity date Jan. 01, 2022   Jan. 01, 2022    
Maximum [Member]          
Debt securities, interest rate 3.50%   3.50%    
Debt securities, maturity date Nov. 01, 2023   Nov. 01, 2023