Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Cash and Cash Equivalents [Table Text Block]

Years Ended December 31,	2019			2018		2017
Cash, cash equivalents and restricted cash, beginning of period	$	278,629		$	233,711	$	189,326
End of the period
Cash and cash equivalents		262,273			272,804		233,711
Restricted cash		5,835			5,825		—
Total cash, cash equivalents and restricted cash, end of period		268,108			278,629		233,711
Net (decrease) increase in cash, cash equivalents and restricted cash	$	(10,521	)	$	44,918	$	44,385