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Note 5 - Intangible Assets (Details Textual) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets, Remaining Amortization Period (Year) | 4 years 2 months 12 days | 4 years 7 months 6 days
Minimum [Member] |  |
Finite-Lived Intangible Assets, Remaining Amortization Period (Year) | 2 years |
Maximum [Member] |  |
Finite-Lived Intangible Assets, Remaining Amortization Period (Year) | 6 years |

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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
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Data Type: | na
Balance Type: |
Period Type: |