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Note 5 - Goodwill and Other Intangible Assets (Details Textual) $ in Thousands, € in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 22, 2021 USD ($) | Jan. 22, 2021 EUR (€) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Goodwill, Acquired During Period |  |  |  |  | $ 281,845 |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) |  |  |  |  |  |  | $ 0
Amortization of Intangible Assets, Total |  |  | $ 1,600 | $ 800 | 4,600 | $ 2,300 |
Acquired 3D Hubs [Member] |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  | 281,800 |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | 30,800 |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) |  |  |  |  | $ (700) |  |
Acquired 3D Hubs [Member] | Europe [Member] |  |  |  |  |  |  |
Goodwill, Acquired During Period | € |  | € 106.5 |  |  |  |  |
Finite-lived Intangible Assets Acquired | € |  | € 11.6 |  |  |  |  |
Acquired 3D Hubs [Member] | UNITED STATES |  |  |  |  |  |  |
Goodwill, Acquired During Period | $ 152,200 |  |  |  |  |  |
Finite-lived Intangible Assets Acquired | $ 16,600 |  |  |  |  |  |

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- 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 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- 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. + Details
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- 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 + Details
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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 -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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