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Note 7 - Stock-based Compensation - Schedule of Share-based Payment Award (Details) - The 2019 Stock Plan [Member] - $ / shares
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Dec. 31, 2021
Apr. 29, 2019
Balance, Shares Available for Grant (in shares)     142,000    
Balance, Outstanding (in shares)     3,763,000    
Balance, Weighted-Average Exercise Price (in dollars per share)     $ 2.29    
Authorized, shares (in shares) 1,338,000   1,338,000   200,000
Options Granted, shares (in shares) (369,000) 0 (1,307,000) (1,140,000)  
Options Granted, shares (in shares) 369,000 0 1,307,000 1,140,000  
Options Granted, Weighted-Average Exercise Price (in dollars per share)     $ 10.97    
Exercised, shares (in shares)     (294,000)    
Exercised, Weighted-Average Exercise Price (in dollars per share)     $ 0.93    
Forfeited/expired, shares (in shares)     67,000    
Forfeited/expired, shares (in shares)     (67,000)    
Forfeited/expired, Weighted-Average Exercise Price (in dollars per share)     $ 11.44    
Balance, Shares Available for Grant (in shares) 151,000   151,000 142,000  
Balance, Outstanding (in shares) 4,709,000   4,709,000 3,763,000  
Balance, Weighted-Average Exercise Price (in dollars per share) $ 4.65   $ 4.65 $ 2.29  
Restricted Stock [Member]          
RSAs Granted, shares (in shares)     (89,000) (120,000)