Note 11 - FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Fair Value, Assets Measured on Recurring Basis

	Fair Value Measurements Using
			Quoted
			Prices in
			Active		Significant
			Markets for		Other
			Identical		Observable		Significant
	September 30,		Assets		Inputs		Unobservable
Assets	2022		(Level 1)		(Level 2)		Inputs (Level 3)
Cash equivalents
Money market mutual funds	$	70,934	$	70,934	$	—	$	—
U.S. Government securities (1)		2,994		2,994		—		—
Short-term investments (available-for-sale debt securities)
U.S. Government securities (1)		22,357		22,357		—		—
Total	$	96,285	$	96,285	$	—	$	—

	Fair Value Measurements Using
			Quoted
			Prices in
			Active		Significant
			Markets for		Other		Significant
			Identical		Observable		Unobservable
	December 31,		Assets		Inputs		Inputs
Assets	2021		(Level 1)		(Level 2)		(Level 3)
Cash equivalents
Money market mutual funds	$	12,474	$	12,474	$	—	$	—
Short-term investments (available-for-sale debt securities)
U.S. Government securities (1)		112,542		112,542		—		—
Total	$	125,016	$	125,016	$	—	$	—