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