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Note 7 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Oct. 01, 2020	Mar. 31, 2020
Fair value	$ 6,700	$ 4,000
Reported Value Measurement [Member] | Fair Value, Recurring [Member]
Cash equivalents	56,101		$ 19,394
Marketable securities	10,239		35,195
Fair value	6,730
Reported Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents	56,101		19,394
Marketable securities	10,239		35,195
Fair value
Reported Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents
Marketable securities
Fair value
Reported Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Cash equivalents
Marketable securities
Fair value	$ 6,730

X

- 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)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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X

- Definition

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

No definition available.

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X

- Definition

Amount of investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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