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, 2023
Mar. 31, 2022
Total potential dilutive securities (in shares) 6,356,165 5,144,657
Share-Based Payment Arrangement, Option [Member]    
Total potential dilutive securities (in shares) [1] 994,068 1,026,712
Restricted Stock Units (RSUs) [Member]    
Total potential dilutive securities (in shares) 5,355,725 4,111,573
Warrant [Member]    
Total potential dilutive securities (in shares) 6,372 6,372
[1] Securities are presented on a weighted average outstanding calculation as required if the securities were dilutive.