Note 3 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

	As of March 31, 2022
	Adjusted		Unrealized		Unrealized			Market
	Cost		Gains		Losses			Value
Level 1:
Money Market Funds	$	3,277	$	-	$	-		$	3,277
U.S. Treasury securities in short-term investments		24,985		-		(29	)		24,956
Total Financial Assets	$	28,262	$	-	$	(29	)	$	28,233

	As of December 31, 2021
	Adjusted		Unrealized		Unrealized			Market
	Cost		Gains		Losses			Value
Level 1:
Money Market Funds	$	1,670	$	-	$	-		$	1,670
U.S. Treasury securities in short-term investments		29,989		-		(6	)		29,983
Total Financial Assets	$	31,659	$	-	$	(6	)	$	31,653