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Note 6 - Equity Incentive Plans (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Share-based compensation expense $ 92,000   $ 192,000 $ 563,000 $ 429,000
Unrecognized compensation cost related to outstanding options 300,000     $ 300,000  
Unrecognized compensation cost weighted-average period of recognition       1 year 7 months 2 days  
Non-vested, Weighted Average Contractual Life (Years)       8 months 4 days  
Maximum shares issued under ESPP       $ 11,000  
General and Administrative Expense [Member]          
Share-based compensation expense 62,000   122,000 324,000 243,000
Research and Development Expense [Member]          
Share-based compensation expense 30,000   70,000 239,000 $ 186,000
Restricted Stock Units [Member]          
Unrecognized compensation cost related to outstanding RSUs 14,000     $ 14,000  
Number of Restricted Stock Units, Granted         20,746
Weighted-average grant date fair value of RSU         $ 25.17
Performance Based Stock Units [Member]          
Number of Restricted Stock Units, Granted         4,576
Weighted-average grant date fair value of RSU         $ 16.9
Stock Option [Member]          
Number of Options Granted (in shares)       12,300 33,997
Weighted-average grant date fair value of options         $ 13.89
Time-based RSU [Member] | General and Administrative Expense [Member]          
Share-based compensation expense   $ 129,000      
Time-based RSU [Member] | Research and Development Expense [Member]          
Share-based compensation expense   $ 125,000      
The 2021 ESPP [Member]          
Percentage of purchase price of common stock       85.00%  
The 2021 ESPP [Member] | Maximum [Member]          
Maximum shares issued under ESPP       $ 25,000,000  
Shares issued under the ESPP.       666  
The ESPP [Member]          
Share based compensation expense $ 3,000   $ 10,000 $ 12,000 $ 10,000
Equity Incentive Plan [Member]          
Common stock capital shares reserved for future issuance (in shares) 0     0  
Equity Incentive Plan [Member] | Stock Option [Member]          
Weighted-average grant date fair value of options       $ 3.8