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Note 6 - Fair Value Measurements - Fair Value of Financial Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Marketable securities	$ 49,352
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Marketable securities	22,807	$ 0
Total	22,910	55,378
Contingent consideration	0	0
Total	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Money market mutual fund	103	55,378
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Marketable securities	26,545	0
Total	26,545	0
Contingent consideration	0	0
Total	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Money market mutual fund	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Marketable securities		0
Total	0	0
Contingent consideration	10,010	0
Total	10,010	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Money market mutual fund	$ 0	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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Fair value of financial and nonfinancial obligations.

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