Note 12 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Share Repurchase Program, Excise Tax	$ 0		$ 352,000
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)	9,939,000	$ 2,297,000
Deferred Income Tax Liabilities, Net	242,337,000		232,398,000
Texas Margin Tax [Member]
Income Tax Expense (Benefit)	0	$ 223,000
Texas Margin Tax [Member] | State and Local Jurisdiction [Member]
Deferred Income Tax Liabilities, Net	9,000,000		$ 8,600,000
Cumulative Effect, Period of Adoption, Adjustment [Member]
Income Tax Expense (Benefit)	1,000,000
Deferred Tax Assets, Gross	$ 3,000,000