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Note 4 - Other Recent Business Transactions or Events - SPAC Investment (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Apr. 01, 2023
Cash and cash equivalents $ 9,575 $ 10,650  
Receivables from brokers, dealers, and clearing agencies 60,317 66,801  
Other assets 4,498 3,741  
Accounts payable and other liabilities (7,283) (8,115)  
Other investments sold, not yet purchased (7,590) (24,742)  
Vellar GP's remaining investment in the SPAC Fund $ 53,953 $ 50,115  
SPAC Fund [Member]      
Cash and cash equivalents     $ 257
Receivables from brokers, dealers, and clearing agencies     68,066
Other investments, at fair value     40,388
Other assets     108
Accounts payable and other liabilities     (82,968)
Other investments sold, not yet purchased     (25,806)
Vellar GP's remaining investment in the SPAC Fund     $ 45