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Note 5 - Transactions With Affiliated Companies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Investment, Affiliated Issuer, Controlled [Member]    
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease) $ 0 $ 0