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Note 7 - Investments (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

Marketable Securities [Table Text Block]

		*Amortized*				*Unrealized*				*Unrealized*
		*Cost Basis*				*Gains*				*Losses*				*Fair Value*
Assets:
Cash equivalents
Money market funds		$	596			$	-			$	—			$	596
Marketable securities:
U.S. government		$	18,991			$	—			$	(76	)		$	18,915
Corporate bonds			6,548				—				(63	)			6,485
Commercial paper			2,014				—				(3	)			2,011
Certificates of deposit			7,745				1				(13	)			7,733
Total marketable securities		$	35,298			$	1			$	(155	)		$	35,144
Total assets at fair value		$	35,894			$	1			$	(155	)		$	35,740

Investments Classified by Contractual Maturity Date [Table Text Block]

		*June 30,*				*December 31,*
		*2023*				*2022*
Maturities within one year		$	27,770			$	44,556
Maturities after one year through three years			7,970				—
Total investments		$	35,740			$	44,556