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Note 7 - Investments (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Marketable Securities [Table Text Block]

		*Amortized*				*Unrealized*				*Unrealized*
		*Cost Basis*				*Gains*				*Losses*				*Fair Value*
Marketable securities:
US government		$	46,554			$	—			$	(102	)		$	46,452
Corporate bonds			4,416				—				(10	)			4,406
Commercial paper			12,336				—				(24	)			12,312
Certificates of deposit			4,074				—				(19	)			4,055
Total marketable securities		$	67,380			$	—			$	(155	)		$	67,225

Investments Classified by Contractual Maturity Date [Table Text Block]

		*September 30,*				*December 31,*
		*2022*				*2021*
Maturities within one year		$	67,225			$	44,779
Maturities after one year through three years			—				675
Total investments		$	67,225			$	45,454