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Note 2 - Summary of Significant Accounting Policies - Antidilutive Securities Excluded From Computation of Earnings Per Share (Details) - shares		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Total potential dilutive securities (in shares)	[1]	4,697,497	5,441,659
Share-based Payment Arrangement, Option [Member]
Total potential dilutive securities (in shares)	[1]	1,038,439	1,390,340
Restricted Stock Units (RSUs) [Member]
Total potential dilutive securities (in shares)	[1]	3,652,686	3,947,819
Warrant [Member]
Total potential dilutive securities (in shares)	[1]	6,372	103,500
[1] The number of shares is based on the maximum number of shares issuable on exercise or conversion of the related securities as of the period end. Such amounts have not been adjusted for the treasury stock method or weighted average outstanding calculations as required if the securities were dilutive.

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

+ Details

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