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Note 3 - Related Party Transactions - Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Assets, related party $ 26,782   $ 24,305
Liabilities, related party 5,067   4,410
GAMCO Investors [Member]      
income (loss) 34 $ 0  
Expense, related party 0 0  
Assets, related party 2,799   2,765
Liabilities, related party 0   0
LGL Group Inc. [Member]      
income (loss) 12 12  
Expense, related party 26 28  
Assets, related party 0   0
Liabilities, related party 6   0
Related Party [Member]      
income (loss) 46 12  
Expense, related party 26 $ 28  
Assets, related party 2,799   2,765
Liabilities, related party $ 6   $ 0