Note 2 - Summary of Significant Accounting Policies - Antidilutive Securities Excluded From Computation of Earnings Per Share (Details) - shares		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Total potential dilutive securities (in shares)	[1]	7,388,576	6,279,959
Share-Based Payment Arrangement, Option [Member]
Total potential dilutive securities (in shares)	[1]	994,267	1,026,712
Restricted Stock Units (RSUs) [Member]
Total potential dilutive securities (in shares)	[1]	6,387,937	5,246,875
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.