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Note 3 - Cash, Cash Equivalents, and Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Money Market Funds [Member]
Amortized cost	$ 3,897	$ 5,113
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	3,897	5,113
US Treasury Securities [Member]
Amortized cost		19,883
Gross unrealized gains		1
Gross unrealized losses		0
Fair value		19,884
Cash Equivalents [Member]
Amortized cost	3,897	24,996
Gross unrealized gains	0	1
Gross unrealized losses	0	0
Fair value	3,897	24,997
Cash [Member]
Amortized cost	10,748	3,824
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	10,748	3,824
Cash and Cash Equivalents [Member]
Amortized cost	14,645	28,820
Gross unrealized gains	0	1
Gross unrealized losses	0	0
Fair value	$ 14,645	28,821
Us Treasury Securities with Maturity Greater than 90 Days but Less than 1 Year [Member]
Amortized cost		6,179
Gross unrealized gains		0
Gross unrealized losses		0
Fair value		6,179
Marketable Securities [Member]
Amortized cost		6,179
Gross unrealized gains		0
Gross unrealized losses		0
Fair value		$ 6,179

X

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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