Note 7 - Long-term Leases - Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating cash flows for operating leases	$ 36,198	$ 36,051	$ 36,079
Operating cash flows for finance leases	215	534	807
Financing cash flows for finance leases	$ 4,985	$ 4,695	$ 4,423