Note 4 - Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Cash and cash equivalents	[1]	$ 21,669	$ 6,329
Restricted cash		1,615	1,141
Short-term investments		11,420	64,195
Total assets		34,704	75,530
Contingent consideration		1,930	1,256
Warrant liabilities		4,842	0
Total liabilities		6,772	1,256
Long-term investments		0	3,865
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	[1]	21,669	6,329
Restricted cash		1,615	1,141
Short-term investments		0	0
Total assets		23,284	7,470
Contingent consideration		0	0
Warrant liabilities		0
Total liabilities		0	0
Long-term investments			0
Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	[1]	0	0
Restricted cash		0	0
Short-term investments		11,420	64,195
Total assets		11,420	68,060
Contingent consideration		0	0
Warrant liabilities		0
Total liabilities		0	0
Long-term investments			3,865
Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	[1]	0	0
Restricted cash		0	0
Short-term investments		0	0
Total assets		0	0
Contingent consideration		1,930	1,256
Warrant liabilities		4,842
Total liabilities		$ 6,772	1,256
Long-term investments			$ 0

[1] Includes investments that are readily convertible to cash with original maturities of 90 days or less.