Note 3 - Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	As of March 31, 2021
	Level 1		Level 2		Level 3		Total
Assets
Money market funds	$	20,583	$	—	$	—	$	20,583
Cash in checking account		—		—		—		919
Total cash and cash equivalents	$	20,583	$	—	$	—	$	21,502

	As of December 31, 2020
	Level 1		Level 2		Level 3		Total
Assets
Money market funds	$	20,662	$	—	$	—	$	20,662
Cash in checking account		—		—		—		745
Total cash and cash equivalents	$	20,662	$	—	$	—	$	21,407