Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Deferred Tax Assets, Valuation Allowance	$ 0	$ 0
Deferred Income Tax Liabilities, Net	169,414	131,164
State and Local Jurisdiction [Member] | Texas Margin Tax [Member]
Deferred Income Tax Liabilities, Net	$ 6,000	$ 4,100
Cumulative Effect, Period of Adoption, Adjustment [Member]
Deferred Tax Assets, Gross, Total			$ 3,400