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Note 5 - Intangible Assets (Details Textual) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets, Remaining Amortization Period (Year) | 4 years 146 days | 4 years 219 days
Minimum [Member] |  |
Finite-Lived Intangible Assets, Remaining Amortization Period (Year) | 2 years |
Maximum [Member] |  |
Finite-Lived Intangible Assets, Remaining Amortization Period (Year) | 7 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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