v3.25.4
Note 8 - Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended 15 Months Ended
Jan. 30, 2026
Mar. 26, 2025
Mar. 25, 2025
Mar. 24, 2025
Mar. 05, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Sep. 30, 2025
Sep. 16, 2025
Mar. 31, 2025
May 14, 2021
Mar. 31, 2019
Oct. 17, 2018
Apr. 29, 2016
Preferred Stock, Shares Authorized (in shares)           1,000,000   1,000,000 1,000,000            
Common Stock, Par or Stated Value Per Share (in dollars per share)         $ 0.001 $ 0.001   $ 0.001 $ 0.001            
Preferred Stock, Par or Stated Value Per Share (in dollars per share)           $ 0.001   $ 0.001 $ 0.001            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)         108                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)           1,962,677   1,962,677 1,988,677            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount           $ 400,000   $ 400,000              
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           2 years                  
Warrants Exercisable Term (Month)           6 months                  
Warrants and Rights Outstanding, Term (Year)           5 years   5 years              
Class of Warrant or Right, Expired During Period (in shares)           1,327 0                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)           1,000 0                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)           0                  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)           $ 0                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value           $ 5,000,000 $ 2,000,000 $ 5,000,000              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)           6 years 8 months 12 days 6 years 3 months 18 days                
Subsequent Event [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 250,000                            
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) $ 0.82                            
Restricted Stock [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           0                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)           $ 0                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value           $ 23,000                  
Restricted Stock [Member] | Subsequent Event [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 390,000                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 0.82                            
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) 14,835                            
Restricted Stock [Member] | Subsequent Event [Member] | Chief Executive Officer [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 300,000                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years                            
Restricted Stock [Member] | Subsequent Event [Member] | Director [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 90,000                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 1 year                            
Restricted Stock [Member] | Subsequent Event [Member] | Shares Per Director [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 22,500                            
Share-Based Payment Arrangement, Option [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)           (0)                  
Share-Based Payment Arrangement, Option [Member] | Subsequent Event [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years                            
The 2025 Stock Incentive Plan [Member]                              
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, Options, Outstanding, Number (in shares)                   200,000          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)                   1,130,571          
The 2025 Stock Incentive Plan [Member] | Restricted Stock [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in shares)                   169,429          
Amended and Restated Stock Incentive Plan [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)           2,400,000   2,400,000             5,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)           0   0              
Placement Agent Warrants [Member]                              
Class of Warrant or Right, Redeemed (in shares)         13,000                    
Warrants and Rights Outstanding, Term (Year)                       5 years      
Class of Warrant or Right, Issued During Period (in shares)   70,000                          
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share)   $ 1.875                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                       $ 2.85 $ 4    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                       179,536      
Warrants or Rights, Exercised During Period (in shares)           0   0              
Series A Warrants [Member]                              
Warrants and Rights Outstanding, Term (Year)                         5 years 6 months    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                         $ 4    
Series B Warrants [Member]                              
Warrants and Rights Outstanding, Term (Year)                         24 months    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                         $ 4    
Series C Warrants [Member]                              
Warrants and Rights Outstanding, Term (Year)                         5 years 6 months    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                         $ 0.05    
Class of Warrant or Right, Maximum Beneficial Ownership                         4.99%    
Class of Warrant or Right, Maximum Beneficial Ownership, Election of Holder                         9.99%    
Series D Preferred Stock Warrants [Member]                              
Warrants and Rights Outstanding, Term (Year)                       5 years 6 months      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                       $ 2.51      
Class of Warrant or Right, Maximum Beneficial Ownership                       4.99%      
Class of Warrant or Right, Maximum Beneficial Ownership, Election of Holder                       9.99%      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                       592,106      
Series C Convertible Preferred Stock [Member]                              
Preferred Stock, Shares Authorized (in shares)                           11,000  
Preferred Stock, Stated Value (in dollars per share)                           $ 1,000  
Preferred Stock, Shares Outstanding (in shares)         350           0        
Preferred Stock, Par or Stated Value Per Share (in dollars per share)         $ 0.001                    
Payments for Repurchase of Equity         $ 332,500                    
Payments for Repurchase of Convertible Preferred Stock         331,000                    
Preferred Stock, Carrying Value         0                    
Series C Convertible Preferred Stock [Member] | Additional Paid-in Capital [Member]                              
Stock Redeemed or Called During Period, Value         $ 331,000                    
March 2025 Registered Direct Offering [Member]                              
Stock Issued During Period, Shares, New Issues (in shares)       1,000,000                      
Common Stock, Par or Stated Value Per Share (in dollars per share)       $ 0.001                      
Shares Issued, Price Per Share (in dollars per share)       $ 1.5                      
Stock Issued During Period, Value, New Issues       $ 1,500,000                      
Proceeds from Issuance of Common Stock       $ 1,300,000                      
Placement Agent Fee, Percentage of Aggregate Purchase Price   7.00%                          
Private Placement [Member]                              
Stock Issued During Period, Shares, New Issues (in shares)     473,979                        
Shares Issued, Price Per Share (in dollars per share)     $ 1.52                        
Stock Issued During Period, Value, New Issues     $ 720,000                        
Proceeds from Issuance of Common Stock     $ 700,000