Annual report pursuant to Section 13 and 15(d)

Note 3 - Summary of Significant Accounting Policies - Antidilutive Securities (Details)

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Note 3 - Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Antidilutive securities (in shares) 2,229,259 1,701,801
Employee and Non-employee Stock Options [Member]    
Antidilutive securities (in shares) 1,896,600 1,389,564
Common Stock Purchase Warrants [Member]    
Antidilutive securities (in shares) 265,000 265,000
Common Stock, Deferred Stock Units Settlement [Member]    
Antidilutive securities (in shares) 67,659 47,237