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Note 5 - Acquisitions and Divestitures (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 04, 2019 | Mar. 31, 2021 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Combination, Contingent Consideration, Liability, Total |  |  | $ 2,100 |  | $ 1,800 | $ 2,100 |
Proceeds from Divestiture of Businesses |  |  |  |  | $ 0 | $ 0 | $ 4,000
Waterstar [Member] |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  |  |  |  |  | 4,000
Gain (Loss) on Disposition of Business |  |  |  |  |  |  | $ 1,000
Gaomei [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 11,300 | $ 11,300 |  |  |
Business Combination, Contingent Consideration, Liability, Total | $ 4,700 |  |  |  |  |  |
Business Combination, Working Capital Adjustment | (200) |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ 0 |  |  |  |  |  |
Gaomei [Member] | Minimum [Member] |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year) | 10 years |  |  |  |  |  |
Gaomei [Member] | Maximum [Member] |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year) | 15 years |  |  |  |  |  |
Gaomei [Member] | Forecast [Member] |  |  |  |  |  |  |
Payment for Contingent Consideration Liability, Financing Activities |  | $ 1,800 |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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