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Note 6 - Stockholders' Equity and Stock-based Compensation (Details Textual)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Sep. 30, 2025
$ / shares
shares
Feb. 05, 2025
shares
Jan. 01, 2025
shares
Jul. 03, 2024
USD ($)
$ / shares
shares
Mar. 28, 2024
USD ($)
$ / shares
shares
Jan. 31, 2025
shares
Dec. 31, 2024
$ / shares
shares
Mar. 31, 2024
shares
Nov. 30, 2017
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Dec. 31, 2017
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2025
$ / shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.001           $ 0.001     $ 0.001   $ 0.001     $ 0.001  
Equity Classified Subscription, Value | $                         $ 47,700      
Right Offering Deemed Dividend | $                       $ 0 47,700      
Proceeds from Warrant Exercises | $                       14,080 1,536      
Share-Based Payment Arrangement, Expense | $                   $ 5,617 $ 2,982 $ 16,487 6,793      
Time-based Options [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) 8,939,677           8,075,265     8,939,677   8,939,677     8,939,677  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                       1,424,343        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Intrinsic Value | $                       $ 20,900        
Share-Based Payment Arrangement, Expense | $                   $ 3,937 2,131 $ 11,623 4,609      
Performance-based Options [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) 442,678           442,678     442,678   442,678     442,678  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                       0        
Share-Based Payment Arrangement, Expense | $                   $ 0 5 $ 0 27      
Market-based Options [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) 2,721,389           2,461,389     2,721,389   2,721,389     2,721,389  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                       260,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Intrinsic Value | $                       $ 4,000        
Share-Based Payment Arrangement, Expense | $                   $ 1,577 $ 788 $ 4,581 $ 1,978      
Performance-based and Market-based Options [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) 1,200,000           0     1,200,000   1,200,000     1,200,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                       1,200,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Intrinsic Value | $                       $ 18,900        
Share-Based Payment Arrangement, Expense | $                   $ 0   $ 0        
The 2017 Plan [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)                           10 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)                           1,500,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) 2,000,000   1,200,000       1,375,000                  
Increase in Shares Available for Issuance, Threshold of Common Stock Outstanding, Number of Shares (in shares)                           1,200,000    
Increase in Shares Available for Issuance, Threshold of Common Stock Outstanding, Percent                           4.00%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 1,072,564                 1,072,564   1,072,564     1,072,564  
The 2017 Inducement Equity Incentive Plan [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)                 10 years              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)                 1,000,000              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)               2,000,000                
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 2,328,709                 2,328,709   2,328,709     2,328,709  
The 2017 Employee Stock Purchase Plan [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)                           250,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)           450,000                    
Increase in Shares Available for Issuance, Threshold of Common Stock Outstanding, Number of Shares (in shares)                           450,000    
Increase in Shares Available for Issuance, Threshold of Common Stock Outstanding, Percent                           1.50%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 851,183                 851,183   851,183     851,183  
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)                       44,596        
Share-Based Payment Arrangement, Tranche One [Member] | Time-based Options [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage                       25.00%        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)                       1 year        
Share-Based Payment Arrangement, Tranche One [Member] | The 2017 Inducement Equity Incentive Plan [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage                 25.00%              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)                 1 year              
Maximum [Member] | The 2017 Inducement Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)                 10 years              
Warrants Issued in 2024 Rights Offering [Member]                                
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)       0.5 0.5                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 205,953     5,999,999           205,953   205,953     205,953  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares       $ 11                        
Class of Warrans or Right, Exercise Price, Percentage of Subscription Price for Units       110.00%                        
Warrants and Rights Outstanding, Term (Year)       5 years                        
Proceeds from Warrant Exercises | $                       $ 14,100     $ 63,500  
Warrants Issued in 2024 Rights Offering [Member] | Vesting of First Half [Member]                                
Class of Warrants or Rights, Redemption Price Per Share (in dollars per share) | $ / shares       $ 0.01                        
Class of Warrant or Right, Percentage Required for Redemption 150.00% 150.00%   150.00%           150.00%   150.00%     150.00%  
Class of Warrant or Right, Vesting, Stock Price Trigger (in dollars per share) | $ / shares       $ 16.5                       $ 18.85
Class of Warrant or Right, Expired/Redeemed During Period (in shares)   18,221                            
Class of Warrant or Right, Outstanding (in shares) 0 0               0   0     0  
Warrants Issued in 2024 Rights Offering [Member] | Vesting of Second Half [Member]                                
Class of Warrants or Rights, Redemption Price Per Share (in dollars per share) | $ / shares       $ 0.01                        
Class of Warrant or Right, Percentage Required for Redemption 200.00%     200.00%           200.00%   200.00%     200.00%  
Class of Warrant or Right, Vesting, Stock Price Trigger (in dollars per share) | $ / shares       $ 22                        
Class of Warrant or Right, Outstanding (in shares) 411,907                 411,907   411,907     411,907  
Warrants Issued in 2024 Rights Offering [Member] | Maximum [Member]                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       6,000,000                        
The 2024 Right Offering [Member]                                
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 0.001 $ 0.001                      
Equity Offering, Units, Maximum Amount Authorized (in shares)       6,000,000 6,000,000                      
Equity Offering Units, Offering Value | $         $ 60,000                      
Shares Issued, Price Per Share (in dollars per share) | $ / shares       $ 10 $ 10                      
Subscription Right, Number of Units         0.10864186                      
Number of Shares Per Unit Issued (in shares)       1 1                      
Number of Warrants in Each Unit (in shares)       2 2                      
Share Price (in dollars per share) | $ / shares         $ 11.55                      
Equity Classified Subscription, Value | $         $ 47,700                      
Right Offering Deemed Dividend | $         $ 47,700                      
Stock Issued During Period, Shares, New Issues (in shares)       5,999,998                        
Proceeds from Issuance or Sale of Equity | $       $ 60,000                        
The 2024 Right Offering [Member] | Majority Stockholder and Co-chairman [Member]                                
Percent of Offering Purchased       88.00%