Note 1 - Basis of Presentation - Summary of Reconciliation of Cash, Cash Equivalents, and Restricted Cash Reported in the Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash, cash equivalents and $5,825 and $0 in restricted cash at beginning of each period	$ 278,629	$ 233,711
Cash and cash equivalents	184,673	230,259
Restricted cash	5,658	5,599
Cash, cash equivalents and $5,658 and $5,599 in restricted cash at end of each period	190,331	235,858
Net (decrease) increase in cash, cash equivalents and restricted cash	$ (88,298)	$ 2,147