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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Jan. 01, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Equity, Attributable to Parent $ 894,535 $ 874,711   $ 858,103 $ 808,082 $ 794,368 $ 760,432
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2023-02 [Member]              
Equity, Attributable to Parent     $ 2,500