Note 1 - General and Basis of Presentation - Cash and Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 54,723	$ 47,818
Restricted cash and cash equivalents	50,332	48,825
Total Cash and cash equivalents and Restricted cash and cash equivalents	$ 105,055	$ 96,643	$ 234,017	$ 264,476