Note 1 - General and Basis of Presentation - Cash and Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 231,149	$ 71,173	$ 79,366
Restricted cash and cash equivalents	88,627	81,937	93,098
Total Cash and cash equivalents and restricted cash and cash equivalents	$ 319,776	$ 153,110	$ 172,464	$ 177,495