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Note 4 - Goodwill and Other Intangible Assets (Details Textual) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2019 | Jul. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Number of Operating Segments | 3 |  |  |  | 3 |
Goodwill, Impairment Loss |  |  | $ 0 |  |  |
Amortization of Intangible Assets, Total |  |  |  |  | $ 7,100 | $ 6,400
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  |  | $ 0 | $ 0
Minimum [Member] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  |  | 1 year |
Maximum [Member] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  |  | 16 years | 16 years
North America [Member] |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | $ 8,900 |  |
Europe [Member] |  |  |  |  |  |
Goodwill, Impairment Loss |  | $ 0 |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  | 17.30% |  |  |  |

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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=121586364&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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