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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2025
Jun. 30, 2024
Accounts and other receivables, allowance for credit loss $ 0 $ 0
Receivable for investment principal repayments, allowance for credit losses 0 0
Investments in available-for-sale debt securities, amortized cost 3,993 [1] 6,204
Investments in available-for-sale debt securities, allowance for credit loss $ 0 $ 0
Treasury shares (in shares) 2,884,312 2,113,516
Common Class A [Member]    
Common Stock, Par value (in dollars per share) $ 0.025 $ 0.025
Common Stock, Shares Authorized (in shares) 28,000,000 28,000,000
Common Stock, Shares, Issued (in shares) 13,866,999 13,866,999
Common Stock, Shares, Outstanding (in shares) 10,982,687 11,753,483
Common Class B [Member]    
Common Stock, Par value (in dollars per share) $ 0.025 $ 0.025
Common Stock, Shares Authorized (in shares) 4,500,000 4,500,000
Common Stock, Shares, Issued (in shares) 0 0
Common Class C [Member]    
Common Stock, Par value (in dollars per share) $ 0.025 $ 0.025
Common Stock, Shares Authorized (in shares) 3,500,000 3,500,000
Common Stock, Shares, Issued (in shares) 2,068,549 2,068,549
Common Stock, Shares, Outstanding (in shares) 2,068,549 2,068,549
[1] Principal payments of $750,000 are due quarterly with a final maturity in January 2026.