Note 4 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Contingent Consideration - Short Term	$ 16,870	$ 13,090
Contingent Consideration - Long Term	70	22,320
Business Combination, Contingent Consideration, Liability, Total	16,900
Estimate of Fair Value Measurement [Member]
Contingent Consideration - Short Term	16,870	13,090
Contingent Consideration - Long Term	70	22,320
Business Combination, Contingent Consideration, Liability, Total	16,940	35,410
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Contingent Consideration - Short Term	0	0
Contingent Consideration - Long Term	0	0
Business Combination, Contingent Consideration, Liability, Total	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Contingent Consideration - Short Term	0	0
Contingent Consideration - Long Term	0	0
Business Combination, Contingent Consideration, Liability, Total	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Contingent Consideration - Short Term	16,870	13,090
Contingent Consideration - Long Term	70	22,320
Business Combination, Contingent Consideration, Liability, Total	16,940	35,410
Reported Value Measurement [Member]
Contingent Consideration - Short Term	0	0
Contingent Consideration - Long Term	0	0
Business Combination, Contingent Consideration, Liability, Total	0	0
Money Market Funds [Member] \| Estimate of Fair Value Measurement [Member]
Cash equivalents	67,038	74,522
Money Market Funds [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash equivalents	67,038	74,522
Money Market Funds [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0	0
Money Market Funds [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash equivalents	0	0
Money Market Funds [Member] \| Reported Value Measurement [Member]
Cash equivalents	$ 67,038	74,522
US Treasury Securities [Member] \| Estimate of Fair Value Measurement [Member]
Investments		2,501
US Treasury Securities [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments		2,501
US Treasury Securities [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments		0
US Treasury Securities [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments		0
US Treasury Securities [Member] \| Reported Value Measurement [Member]
Investments		$ 2,524

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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