Note 1 - General and Basis of Presentation - Cash and Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 173,718	$ 71,173	$ 110,665
Restricted cash and cash equivalents	76,116	81,937	70,974
Total Cash and cash equivalents and restricted cash and cash equivalents	$ 249,834	$ 153,110	$ 181,639	$ 177,495