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Note 5 - Goodwill and Other Intangible Assets (Details Textual) $ in Thousands, € in Millions			3 Months Ended
	Jan. 22, 2021 USD ($)	Jan. 22, 2021 EUR (€)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Goodwill, Acquired During Period			$ 275,438
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)			0
Amortization of Intangible Assets, Total			1,500	$ 800
Acquired 3D Hubs [Member]
Goodwill, Acquired During Period			275,400
Finite-lived Intangible Assets Acquired			34,700
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)			$ (600)
Acquired 3D Hubs [Member] | Europe [Member]
Goodwill, Acquired During Period | €		€ 104.0
Finite-lived Intangible Assets Acquired | €		€ 13.1
Acquired 3D Hubs [Member] | UNITED STATES
Goodwill, Acquired During Period	$ 148,800
Finite-lived Intangible Assets Acquired	$ 18,700

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 350
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-Section 45
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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

No definition available.

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X

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 350
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