Note 1 - General and Basis of Presentation - Cash and Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 79,366	$ 98,802	$ 54,723
Restricted cash and cash equivalents	93,098	78,693	50,332
Total Cash and cash equivalents and restricted cash and cash equivalents	$ 172,464	$ 177,495	$ 105,055	$ 96,643