Note 6 - Intellectual Property (Details Textual)	9 Months Ended
Sep. 30, 2021
Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)	1 year 8 months 12 days
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)	5 years 7 months 6 days

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.

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

Name:	us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration