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Note 7 - Related Party Transactions - Transactions With Related Parties (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Income $ 1,068 $ 721 $ 1,956 $ 1,705  
Expense (831) (853) (1,640) (1,587)  
Assets 42,247   42,247   $ 41,850
Liabilities 1,343   1,343   1,168
GAMCO Investors, Inc. [Member]          
Income 441 388 849 822  
Expense 0 0 0 0  
Assets 33,488   33,488   32,568
Liabilities 0   0   0
Mtron Industries Inc [Member]          
Income 0 0 0 0  
Expense (15) 12 (29) (4)  
Assets 0   0   0
Liabilities 74   74   0
Related Party [Member]          
Income 441 388 849 822  
Expense (15) $ 12 (29) $ (4)  
Assets 33,488   33,488   32,568
Liabilities $ 74   $ 74   $ 0