Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Total potential dilutive securities (in shares) [1] 7,115,339 8,529,231
Share-based Payment Arrangement, Option [Member]    
Total potential dilutive securities (in shares) [1] 1,387,673 3,463,692
Restricted Stock Units (RSUs) [Member]    
Total potential dilutive securities (in shares) [1] 5,624,166 259,792
Warrant [Member]    
Total potential dilutive securities (in shares) [1] 103,500 4,805,747
[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.