Note 1 - Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Cash and Cash Equivalents [Table Text Block]

Nine months ended September 30,	2021		2020
Cash, cash equivalents and restricted cash, beginning of period	$	437,648	$	268,108
End of the period
Cash and cash equivalents		464,049		388,024
Restricted cash		1,512		1,512
Total cash, cash equivalents and restricted cash, end of period		465,561		389,536
Net increase in cash, cash equivalents and restricted cash	$	27,913	$	121,428