Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Deferred Tax Assets, Valuation Allowance	$ 0		$ 0
Income Tax Expense (Benefit), Total	14,507	$ (312)
Deferred Income Tax Liabilities, Net	145,671		131,164
State and Local Jurisdiction [Member] | Texas Margin Tax [Member]
Deferred Income Tax Liabilities, Net	$ 4,700		$ 4,100
Cumulative Effect, Period of Adoption, Adjustment [Member]
Deferred Tax Assets, Gross, Total		3,400
Income Tax Expense (Benefit), Total		$ 3,400