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Note 3 - Investments - Schedule of Allowance for Credit Loss on Held to Maturity Investments (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2024
Mar. 31, 2024
Mar. 31, 2023
Balance [1]   $ 0  
Provision for credit losses - reversal (1) $ 20,000 75,000 [2] $ 0
Balance [1] $ 157,000 157,000  
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Balance   $ 232,000  
[1] Held-to-maturity debt investments are carried at amortized cost, net of allowance for credit losses, and the fair value is classified as Level 2 according to the fair value hierarchy.
[2] Represents the change in present value attributable to the passage of time included in interest income.