Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Summary of Significant Accounting Policies - Antidilutive Securities Excluded From Computation of Earnings Per Share (Details)

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Note 2 - Summary of Significant Accounting Policies - Antidilutive Securities Excluded From Computation of Earnings Per Share (Details) - shares
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Total potential dilutive securities (in shares) [1] 5,144,657 5,818,431
Share-Based Payment Arrangement, Option [Member]    
Total potential dilutive securities (in shares) [1] 1,026,712 1,040,522
Restricted Stock Units (RSUs) [Member]    
Total potential dilutive securities (in shares) [1] 4,111,573 4,771,537
Warrant [Member]    
Total potential dilutive securities (in shares) [1] 6,372 6,372
[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.