Note 5 - Operating Assets and Liabilities - Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Total other noncurrent liabilities	$ 105,469	$ 9,980
Other Noncurrent Liabilities [Member]
Interest rate swap liability	78,612	0
Operating lease liabilities	11,146	0
Accrued compensation and related benefits	7,154	6,683
Deferred revenue	5,514	2,837
All other noncurrent liabilities	$ 3,043	$ 460