Note 6 - Fair Value - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Cash and cash equivalents	[1]	$ 6,329	$ 18,129
Restricted cash		1,141	1,154
Short-term investments		64,195	80,262
Long-term investments		3,865	37,435
Total assets measured at fair value		75,530	136,980
Contingent consideration		1,256	2,371
Total liabilities measured at fair value		1,256	2,371
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	[1]	6,329	18,129
Restricted cash		1,141	1,154
Short-term investments		0	0
Long-term investments		0	0
Total assets measured at fair value		7,470	19,283
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		64,195	80,262
Long-term investments		3,865	37,435
Total assets measured at fair value		68,060	117,697
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		1,256	2,371
Total liabilities measured at fair value		$ 1,256	$ 2,371

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