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Note 4 - Stock-based Compensation - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Options granted (in shares) 450  
Granted, weighted average exercise price (in dollars per share) $ 21.24  
Options outstanding, weighted average contractual ife (Year) 9 years  
Options outstanding, aggregate intrinsic value $ (9,382)  
Exercised, weighted average exercise price (in dollars per share) $ 0  
Options forfeited (in shares) (60)  
Forfeited, weighted average exercise price (in dollars per share) $ 15.77  
Balance (in shares) 1,111  
Options outstanding, weighted average exercise price (in dollars per share) $ 17.99  
Options outstanding, aggregate intrinsic value $ 9,382  
Share-based Payment Arrangement, Option [Member]    
Balance (in shares) 721 0
Options outstanding, weighted average exercise price (in dollars per share) $ 15.77 $ 0
Options granted (in shares)   721
Granted, weighted average exercise price (in dollars per share)   $ 15.77
Options outstanding, weighted average contractual ife (Year)   9 years 9 months 18 days
Options outstanding, aggregate intrinsic value   $ (692)
Balance (in shares)   721
Options outstanding, weighted average exercise price (in dollars per share)   $ 15.77
Options outstanding, aggregate intrinsic value   $ 692
Exercisable (in shares) 0  
Exercisable, weighted average exercise price (in dollars per share) $ 0  
Exercisable, options outstanding, aggregate intrinsic valueo $ 0