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Note 3 - Cash, Cash Equivalents, and Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Schedule of Cash and Cash Equivalents [Table Text Block]

		*March 31, 2024*
(in thousands)		*Amortized Cost*				*Gross Unrealized Gains*				*Gross Unrealized Losses*				*Fair Value*
Cash equivalents (contractual maturity within 90 days):
U.S. Treasury securities		$	12,192			$	—			$	(1	)		$	12,191
Money market funds			5,660				—				—				5,660
Total cash equivalents			17,852				—				(1	)			17,851
Cash			3,881				—				—				3,881
Total cash and cash equivalents		$	21,733			$	—			$	(1	)		$	21,732

Marketable securities (contractual maturity greater than 90 days but less than 1 year):
U.S. Treasury securities		$	6,179			$	—			$	(1	)		$	6,178
Total marketable securities		$	6,179			$	—			$	(1	)		$	6,178

		*December 31, 2023*
(in thousands)		*Amortized Cost*				*Gross Unrealized Gains*				*Gross Unrealized Losses*				*Fair Value*
Cash equivalents (contractual maturity within 90 days):
U.S. Treasury securities		$	19,883			$	1			$	—			$	19,884
Money market funds			5,113				—				—				5,113
Total cash equivalents			24,996				1				—				24,997
Cash			3,824				—				—				3,824
Total cash and cash equivalents		$	28,820			$	1			$	—			$	28,821

Marketable securities (contractual maturity greater than 90 days but less than 1 year):
U.S. Treasury securities		$	6,179			$	—			$	—			$	6,179
Total marketable securities		$	6,179			$	—			$	—			$	6,179