Note 4 - Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

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

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