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Note 6 - Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Goodwill, balance as of the beginning of the period | $ 128,504 | $ 28,916
Goodwill acquired during the period | 248 | 99,588
Goodwill, balance as of the end of the period | 128,752 | 128,504
UNITED STATES |  |
Goodwill, balance as of the beginning of the period | 123,635 | 24,047
Goodwill acquired during the period | 248 | 99,588
Goodwill, balance as of the end of the period | 123,883 | 123,635
Europe [Member] |  |
Goodwill, balance as of the beginning of the period | 4,239 | 4,239
Goodwill acquired during the period |  |
Goodwill, balance as of the end of the period | 4,239 | 4,239
JAPAN |  |
Goodwill, balance as of the beginning of the period | 630 | 630
Goodwill acquired during the period |  |
Goodwill, balance as of the end of the period | $ 630 | $ 630

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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=108376223&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=country_US
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Data Type: | na
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- Details
Name: | srt_StatementGeographicalAxis=srt_EuropeMember
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Data Type: | na
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- Details
Name: | srt_StatementGeographicalAxis=country_JP
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Data Type: | na
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