Note 3 - Cash and Investments

9 Months Ended

Sep. 30, 2023

Notes to Financial Statements

Cash, Cash Equivalents, and Short-Term Investments [Text Block]

3. Cash and Investments

Cash, cash equivalents, restricted cash and short-term investments consisted of the following (in thousands):

	September 30, 2023		December 31, 2022
Cash	$	1,541	$	2,243
Cash equivalents (see detail in Note 4)		7,275		33,171
Restricted cash (see detail in Note 4)		222		221
Total cash, cash equivalents and restricted cash		9,038		35,635
Short-term investments		22,796		7
Total cash, cash equivalents, restricted cash and short-term investments	$	31,834	$	35,642

The following table sets forth information regarding the amortized cost basis and fair value of our short-term investments that are classified as held-to-maturity ("HTM") (in thousands):

							Gross		Gross
	Amortized		Allowance for		Net carrying		unrealized		unrealized		Fair
	cost		credit losses		amount		gains		losses		value
U.S. treasury securities	$	22,796	$	—	$	22,796	$	—	$	—	$	22,796
Total	$	22,796	$	—	$	22,796	$	—	$	—	$	22,796