Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Stockholders' Equity - Stock-based Compensation Plan Activity (Details)

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Note 12 - Stockholders' Equity - Stock-based Compensation Plan Activity (Details) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Number of shares available for grant (in shares)     5,262,254   5,262,254  
Balance, options (in shares)     994,267   994,267  
Granted, available for grant (in shares)         (489,569)  
Granted, options (in shares) 0     0 0 0
Exercised/ Released, options (in shares)         0  
Expired inducement grant, options (in shares)         (840,000)  
Forfeited, available for grant (in shares)         187,550  
Forfeited, options (in shares)         (41,072)  
Returned to Plan, available for grant (in shares)         947,418  
Number of shares available for grant (in shares) 5,907,653       5,907,653  
Balance, options (in shares) 113,195       113,195  
Restricted Stock Units (RSUs) [Member]            
Balances, RSUs (in shares)     6,387,937   6,387,937  
Granted, RSUs (in shares) 136,254 204,547 64,149   489,569  
Exercised/ Released, RSUs (in shares)         (2,568,621)  
Forfeited, RSUs (in shares)         (146,478)  
Returned to Plan, RSUs (in shares)         947,418  
Balances, RSUs (in shares) 5,109,825       5,109,825