Note 7 - Long-term Leases - Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating cash flows for operating leases	$ 27,034
Operating cash flows for finance leases	1,001
Financing cash flows for finance leases	$ 2,920	$ 2,751