Note 13 - Stockholders' Equity and Earnings Per Share (Details Textual) - USD ($) shares in Thousands, $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval	$ 420.4	$ 296.2
Preferred Stock, Shares Outstanding (in shares)	0
Preferred Stock, Shares Issued (in shares)	0