v3.22.2.2
Note 11 - Stock Option Plan and Stock-based Compensation - Stock Option Activity (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Beginning balance, number of shares outstanding (in shares) 192,898 65,471 112,932
Beginning balance, weighted average exercise price per share (in dollars per share) $ 8.46 $ 16.86 $ 15.37
Number of options outstanding, options cancelled (in shares) 0   (47,461)
Options cancelled, weighted average exercise price per share (in dollars per share)     $ 0
Number of options outstanding, options granted (in shares) 0 127,427 0
Options granted, weighted average exercise price per share (in dollars per share)   $ 4.14  
Ending balance, number of shares outstanding (in shares) 192,898 192,898 65,471
Ending balance, weighted average exercise price per share (in dollars per share) $ 8.46 $ 8.46 $ 16.86
Vested and expected to vest (in shares) 192,898 192,898  
Vested and expected to vest, weighted average exercise price per share (in dollars per share) $ 8.46 $ 8.46  
Share-Based Payment Arrangement, Option [Member]      
Beginning balance, number of shares available for grant (in shares) 1,257,334 461,587 343,871
Number of shares available for grant, options authorized (in shares)   923,174 461,587
Number of shares available for grant, options cancelled (in shares)     47,461
Effect of plan amendment on business combination (in shares)     (391,332)
Number of shares available for grant, options granted (in shares)   (127,427)  
Ending balance, number of shares available for grant (in shares) 1,257,334 1,257,334 461,587