Note 13 - Income Taxes (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
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)	2,297,000	$ 14,507,000
Deferred Income Tax Liabilities, Net	198,757,000		197,068,000
Texas Margin Tax [Member]
Income Tax Expense (Benefit)	223,000	$ 0
Texas Margin Tax [Member] | State and Local Jurisdiction [Member]
Deferred Income Tax Liabilities, Net	7,300,000		$ 7,100,000
Cumulative Effect, Period of Adoption, Adjustment [Member]
Income Tax Expense (Benefit)	$ 1,000,000