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Note 8 - Shareholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2022
Dec. 28, 2021
Oct. 16, 2019
May 31, 2022
Apr. 30, 2022
Mar. 31, 2022
Jan. 31, 2022
Oct. 31, 2021
Jun. 30, 2021
May 31, 2021
Apr. 30, 2021
Mar. 31, 2021
Feb. 28, 2021
Jan. 31, 2021
Oct. 31, 2020
Jul. 31, 2020
Oct. 31, 2019
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 08, 2020
Preferred Stock, Shares Authorized (in shares) 50,000,000                                 50,000,000     50,000,000         50,000,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) $ 0.001                                 $ 0.001     $ 0.001         $ 0.001    
Preferred Stock, Shares Issued (in shares) 5,000,000                                 5,000,000     5,000,000         5,000,000    
Dividends, Preferred Stock, Cash                                   $ 1,000,501 $ 1,000,500 $ 1,000,502   $ 560,281 $ 560,279 $ 100,050   $ 3,001,503 $ 1,220,610  
Common Stock, Shares Authorized (in shares) 150,000,000                                 150,000,000     150,000,000         150,000,000    
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.001                                 $ 0.001     $ 0.001         $ 0.001    
Common Stock, Shares, Issued (in shares) 59,946,090                                 59,946,090     57,783,340         59,946,090    
Stock Issued During Period, Value, New Issues                                   $ 178,000 $ 661,000 405,000   1,472,600 15,795,815 $ 15,795,815        
Stock Issued During Period, Shares, Issued for Services (in shares)                 25,000   40,000   40,000                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                                   1,030,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                                                   $ 0.99    
Preferred Stock, Shares Outstanding, Ending Balance (in shares) 5,000,000                                 5,000,000     5,000,000         5,000,000    
Common Stock, Shares, Outstanding, Ending Balance (in shares) 59,946,090                                 59,946,090     57,783,340         59,946,090    
Minimum [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)                                                   1 year    
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)                                                   5 years    
Prepaid Expense in Conjunction With the Issuances of Shares [Member]                                                        
Prepaid Expense                 $ 80,500   $ 143,600   $ 155,200                 80,500         80,500  
Share-Based Payment Arrangement, Employee [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)         100,000                                              
Option Indexed to Issuer's Equity, Strike Price (in dollars per share)         $ 1                                              
Share-Based Payment Arrangement, Expense         $ 0                                              
Restricted Stock [Member]                                                        
Stock Issued During Period, Shares, New Issues (in shares)   466,713   458,887   444,243                                            
Stock Issued During Period, Shares, Issued for Services (in shares)                 25,000                                      
Share-Based Payment Arrangement, Expense                                   $ 593,617       641,267       $ 242,382 1,218,110  
Restricted Stock [Member] | Prepaid Expense in Conjunction With the Issuances of Shares [Member]                                                        
Prepaid Expense                 $ 80,500                         80,500         80,500  
Restricted Stock [Member] | Share-Based Payment Arrangement, Employee [Member]                                                        
Stock Issued During Period, Shares, New Issues (in shares)             30,000 5,000           167,500                            
Stock Issued During Period, Value, New Issues             $ 29,250             $ 494,125                            
Share-Based Payment Arrangement, Option [Member]                                                        
Stock Issued During Period, Shares, Issued for Services (in shares)                 50,000                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)                 12 months                                 2 years 9 months 18 days    
Share-Based Payment Arrangement, Option [Member] | Prepaid Expense in Conjunction With the Issuances of Shares [Member]                                                        
Prepaid Expense                 $ 125,250                         125,250         $ 125,250  
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Employee [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)             130,000             80,000                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)                           10 years                            
Share-Based Payment Arrangement, Expense                                   79,500       66,967            
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                           $ 3.10                            
Representative of the Underwriters [Member] | Warrants to Purchase Common Stock [Member]                                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                                               150,502       150,502
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                                               $ 3.74       $ 3.74
Warrants and Rights Outstanding                                                       $ 254,950
Professional Athlete [Member]                                                        
Stock Issued During Period, Shares, Issued for Services (in shares)             320,000         180,000                                
Stock Issued During Period, Value, Issued for Services             $ 336,000         $ 800,000       $ 1,400,000                 $ 800,000      
Professional Athlete [Member] | Restricted Stock [Member]                                                        
Stock Issued During Period, Shares, New Issues (in shares)                     40,000                                  
Stock Issued During Period, Shares, Issued for Services (in shares)                       180,000                                
Stock Issued During Period, Value, Issued for Services                       $ 800,000                                
Professional Athlete [Member] | Restricted Stock [Member] | Prepaid Expense in Conjunction With the Issuances of Shares [Member]                                                        
Prepaid Expense                     $ 143,600 $ 649,800                     649,800          
Executive Officer [Member]                                                        
Stock Issued During Period, Shares, New Issues (in shares)       125,000                                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                     750,000                                  
Share-Based Payment Arrangement, Expense                                           $ 195,346            
Executive Officer [Member] | Restricted Stock [Member]                                                        
Stock Issued During Period, Shares, New Issues (in shares)               25,000     750,000       50,000                          
Stock Issued During Period, Value, New Issues                             $ 100,000                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)               4 months                                        
Executive Officer [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche One [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)                             1 year                          
Executive Officer [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Minimum [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)                             1 year                          
Executive Officer [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche Two [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)                             2 years                          
Executive Officer [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche Three [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)                             3 years                          
Executive Officer [Member] | Share-Based Payment Arrangement, Option [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)               75,000             350,000                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)                             5 years                          
Share-Based Payment Arrangement, Expense                                   $ 23,025   $ 31,054           $ 46,050    
Executive Officer [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche One [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)                             1 year                          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                             $ 3.50                          
Executive Officer [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche Two [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)                             2 years                          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                             $ 5.00                          
Executive Officer [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche Three [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)                             3 years                          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                             $ 6.50                          
Board of Directors [Member] | Restricted Stock [Member]                                                        
Stock Issued During Period, Shares, New Issues (in shares)           20,000           27,000                                
Stock Issued During Period, Value, New Issues           $ 16,360           $ 118,800                                
Stock Issued During Period, Value, Issued for Services                       $ 118,800                                
Board of Directors [Member] | Restricted Stock [Member] | Vesting June, 30, 2021 [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage                       25.00%                   25.00%            
Board of Directors [Member] | Restricted Stock [Member] | Vesting September, 30, 2021 [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage                       25.00%                 25.00%              
Board of Directors [Member] | Restricted Stock [Member] | Vesting on December 31, 2021 [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage                       25.00%               25.00%                
Board of Directors [Member] | Restricted Stock [Member] | Vesting on March 31, 2022 [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage                       25.00%             25.00%                  
Board of Directors [Member] | Share-Based Payment Arrangement, Option [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)           120,000           150,000                                
Option Indexed to Issuer's Equity, Strike Price (in dollars per share)           $ 0.818           $ 4.40                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)           5 years           5 years                                
Board of Directors [Member] | Share-Based Payment Arrangement, Option [Member] | Prepaid Expense in Conjunction With the Issuances of Shares [Member]                                                        
Prepaid Expense           $ 57,000           $ 395,850             $ 57,000       $ 395,850          
A New Executive [Member] | Share-Based Payment Arrangement, Option [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       405,000                                                
Option Indexed to Issuer's Equity, Strike Price (in dollars per share)       $ 0.84                                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)       5 years                                                
Consultant [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)         200,000                                              
Option Indexed to Issuer's Equity, Strike Price (in dollars per share)         $ 1                                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)         5 years                                              
Share-Based Payment Arrangement, Expense         $ 131,300                                              
Consultant [Member] | Vesting 6 Months From Effective Date [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares)         50,000                                              
Consultant [Member] | Vesting Upon Renewal of Consulting Agreement [Member]                                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares)         100,000                                              
Consultant [Member] | Share-Based Payment Arrangement, Option [Member]                                                        
Share-Based Payment Arrangement, Expense       $ 176,985                                                
Series A Cumulative Convertible Preferred Stock [Member]                                                        
Preferred Stock, Shares Authorized (in shares)                                 5,000,000                      
Preferred Stock, Dividend Rate, Percentage 8.00%   8.00%                           8.00%                   8.00%  
Preferred Stock, Shares Issued (in shares) 5,000,000                                 5,000,000     5,000,000         5,000,000    
Stock Issued During Period, Shares, New Issues (in shares)                                                     2,300,000  
Proceeds from Issuance of Convertible Preferred Stock                                                     $ 17,250,000  
Proceeds From Issuance of Convertible Preferred Stock, Net of Underwriting Discounts and Commissions                                                     $ 15,800,000  
Preferred Stock, Shares Outstanding, Ending Balance (in shares) 5,000,000                                 5,000,000     5,000,000         5,000,000    
Common Stock Earnout Shares [Member]                                                        
Stock Issued During Period, Shares, New Issues (in shares)                   562,278   3,348,520