Note 4 - Fair Value - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Cash and cash equivalents	[1]	$ 7,675	$ 6,329
Restricted cash		1,354	1,141
Short-term investments		32,297	64,195
Total assets measured at fair value		41,326	75,530
Contingent consideration		1,564	1,256
Total liabilities measured at fair value		1,564	1,256
Long-term investments		0	3,865
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	[1]	7,675	6,329
Restricted cash		1,354	1,141
Short-term investments		0	0
Total assets measured at fair value		9,029	7,470
Contingent consideration		0	0
Total liabilities measured at fair value		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		32,297	64,195
Total assets measured at fair value		32,297	68,060
Contingent consideration		0	0
Total liabilities measured at fair value		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 measured at fair value		0	0
Contingent consideration		1,564	1,256
Total liabilities measured at fair value		$ 1,564	1,256
Long-term investments			$ 0

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