Note 3 - Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

		March 31, 2023
Assets	Classification	Level 1		Level 2		Level 3		Total
Money market funds	Cash and cash equivalents	$	50,700	$	—	$	—	$	50,700
Total assets measured at fair value		$	50,700	$	—	$	—	$	50,700

		December 31, 2022
Assets	Classification	Level 1		Level 2		Level 3		Total
Money market funds	Cash and cash equivalents	$	57,973	$	—	$	—	$	57,973
Total assets measured at fair value		$	57,973	$	—	$	—	$	57,973