Note 6 - Long-term Leases - Balance Sheet Classification (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finance lease assets	$ 16,173
Operating lease right-of-use assets	202,909	$ 0
Total	219,082
Finance lease liabilities	4,166	3,924
Operating lease liabilities	24,243	0
Noncurrent lease liabilities, finance leases	14,963	19,128
Noncurrent lease liabilities, operating leases	178,666	$ 0
Total	$ 222,038