Quarterly report pursuant to Section 13 or 15(d)

Investments in Debt Securities (Narrative) (Details)

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Investments in Debt Securities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Amortization of premiums on debt securities $ 26 $ 93 $ 62 $ 195
Minimum [Member]        
Debt securities, interest rate 0.35%   0.35%  
Debt securities, maturity date Feb. 01, 2023   Feb. 01, 2023  
Maximum [Member]        
Debt securities, interest rate 4.70%   4.70%  
Debt securities, maturity date Feb. 01, 2024   Feb. 01, 2024