Note 4 - Fair Value - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Cash and cash equivalents	[1]	$ 18,737	$ 6,329
Restricted cash		1,142	1,141
Short-term investments		37,697	64,195
Long-term investments		958	3,865
Total assets measured at fair value		58,534	75,530
Contingent consideration		1,361	1,256
Total liabilities measured at fair value		1,361	1,256
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	[1]	18,737	6,329
Restricted cash		1,142	1,141
Short-term investments		0	0
Long-term investments		0	0
Total assets measured at fair value		19,879	7,470
Contingent consideration		0	0
Total liabilities measured at fair value		0	0
Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	[1]	0	0
Restricted cash		0	0
Short-term investments		37,697	64,195
Long-term investments		958	3,865
Total assets measured at fair value		38,655	68,060
Contingent consideration		0	0
Total liabilities measured at fair value		0	0
Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	[1]	0	0
Restricted cash		0	0
Short-term investments		0	0
Long-term investments		0	0
Total assets measured at fair value		0	0
Contingent consideration		1,361	1,256
Total liabilities measured at fair value		$ 1,361	$ 1,256

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