Note 3 - Cash and Investments

6 Months Ended

Jun. 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):

	June 30, 2023		December 31, 2022
Cash	$	1,212	$	2,243
Cash equivalents (see detail in Note 4)		12,101		33,171
Restricted cash (see detail in Note 4)		221		221
Total cash, cash equivalents and restricted cash		13,534		35,635
Short-term investments		19,831		7
Total cash, cash equivalents, restricted cash and short-term investments	$	33,365	$	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	$	19,831	$	—	$	19,831	$	—	$	—	$	19,831
Total	$	19,831	$	—	$	19,831	$	—	$	—	$	19,831