Note 6 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%		21.00%
Deferred Tax Liabilities, Net	$ 98,700		$ 98,700
Income Tax Expense (Benefit)	2,897	$ 8,657	$ 9,218	$ 16,567
State and Local Jurisdiction [Member] | Tennessee Department of Revenue [Member]
Income Tax Expense (Benefit)	$ (1,000)