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Note 6 - Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Jan. 15, 2024
Apr. 15, 2023
Mar. 12, 2023
Dec. 16, 2022
Dec. 15, 2022
Mar. 25, 2022
Dec. 31, 2021
Dec. 17, 2021
May 14, 2021
Mar. 08, 2021
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Stock Issued During Period, Shares, Issued for Services (in shares)                         0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       16,500       15,000 70,000   0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value                 $ 128,726        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value       $ 37,969     $ 22,919            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)                     0 0 0
Chief Executive Officer [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)                 20,000        
Robert Siqveland [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         20,000       20,000        
Robert Siqveland [Member] | Selling, General and Administrative Expenses [Member]                          
Severance Costs                         $ 141,500
Robert Siqveland [Member] | Forecast [Member]                          
Severance Costs $ 33,500 $ 100,500                      
Chief Financial Officer [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)                 30,000        
Restricted Stock [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     10,000             15,200      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     3 years             2 years      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 50,500             $ 45,300   $ 366,000  
Share-Based Payment Arrangement, Expense                     $ 19,477 $ 5,662  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)                     80,000 115,200  
Restricted Stock [Member] | Robert Siqveland [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         12,500 12,500              
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)         $ 718                
Share-Based Payment Arrangement, Expense         $ 39,000                
Restricted Stock [Member] | Chief Financial Officer [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           87,500              
Restricted Stock [Member] | Chief Financial Officer and Corporate Secretary [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)           5 years              
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total           $ 349,000              
Restricted Stock [Member] | Chief Financial Officer and Corporate Secretary [Member] | Share-Based Payment Arrangement, Tranche One [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           20,000              
Share-Based Payment Arrangement, Option [Member]                          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total                     $ 319,000    
Share-Based Payment Arrangement, Expense                     $ 5,747 $ 8,045  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                         3 years
Share-Based Payment Arrangement, Option [Member] | Vesting Immediately [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                 25.00%        
Share-Based Payment Arrangement, Option [Member] | Vesting Each Subsequent Year [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                 25.00%        
Share-Based Payment Arrangement, Option [Member] | Robert Siqveland [Member]                          
Share-Based Payment Arrangement, Expense         $ 37,000                
Share-Based Payment Arrangement, Option [Member] | The 2021 Stock 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)                 500,000