Note 3 - Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

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

	As of March 31, 2023
	Adjusted		Unrealized		Unrealized		Market
	Cost		Gains		Losses		Value
Level 1:
Money Market Funds	$	2,764	$	-	$	-	$	2,764
U.S. Treasury securities in short-term investments		-		-		-		-
Certificate of Deposits		6,500		-		-		6,500
Total Financial Assets	$	9,264	$	-	$	-	$	9,264

	As of December 31, 2022
	Adjusted		Unrealized		Unrealized		Market
	Cost		Gains		Losses		Value
Level 1:
Money Market Funds	$	3,004	$	-	$	-	$	3,004
U.S. Treasury securities in short-term investments		9,849		100		-		9,949
Certificate of Deposits		4,000		-		-		4,000
Total Financial Assets	$	16,853	$	-	$	-	$	16,953