Note 14 - Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Fair Value, by Balance Sheet Grouping [Table Text Block]

	Year Ended December 31, 2021
	(in thousands)
	Level 1		Level 2		Level 3		Total
Assets
Cash Equivalents:
U.S. treasury bills	$	—	$	199,999	$	—	$	199,999
Certificate of deposits		—		1,433		—		1,433
Short term investments:
Certificate of deposits		—		2,411		—		2,411
Other assets:
Certificate of deposits		—		285		—		285
Total	$	—	$	204,128	$	—	$	204,128
Liabilities
Earn-out liabilities (1)	$	—	$	—	$	10,012	$	10,012
Warrant liabilities (1)		—		458		—		458
Total	$	—	$	458	$	10,012	$	10,470

	Year Ended December 31, 2020
	(in thousands)
	Level 1		Level 2		Level 3		Total
Assets
Cash Equivalents:
Certificate of deposits	$	—	$	919	$	—	$	919
Short term investments:
Certificate of deposits		—		992		—		992
Other assets:
Certificate of deposits		—		800		—		800
Total	$	—	$	2,711	$	—	$	2,711