Note 3 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

	As of March 31, 2022
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	9,719	$	—	$	—	$	9,719
Cash in checking account		—		—		—		211
Total cash and cash equivalents	$	9,719	$	—	$	—	$	9,930

	As of December 31, 2021
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	12,917	$	—	$	—	$	12,917
Cash in checking account		—		—		—		(45	)
Total cash and cash equivalents	$	12,917	$	—	$	—	$	12,872