General form of registration statement for all companies including face-amount certificate companies

Note 2 - Summary of Significant Accounting Policies (Details Textual)

v3.24.4
Note 2 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Income Statement [Abstract]            
Research and Development Expense (Income) $ 3,182,000 $ 1,096,000 $ 5,608,000 $ 8,094,000 $ 8,793,000 $ 13,884,000
Royalty Agreement Liability, Fair Value Disclosure $ 11,900,000   $ 11,900,000   $ 8,000,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate     0.00%      
Number of Operating Segments     1   1  
Government Assistance, Operating Income, Increase (Decrease), Statement of Income or Comprehensive Income [Extensible Enumeration] Research and Development Expense (Income)          
Grant From Department of Health and Human Services [Member]            
Government Assistance, Award Amount $ 500,000   $ 500,000      
Government Assistance, Operating Income, Increase (Decrease) 14,000          
Convertible Debt [Member]            
Debt Instrument, Fee Amount $ 100,000   $ 100,000      
Measurement Input, Probability-weighted Cash Flow Estimates [Member]            
Royalty Agreement Liability, Measurement Input 0.24   0.24      
Measurement Input, Weighted Average Cost of Capital [Member]            
Royalty Agreement Liability, Measurement Input 0.245   0.245