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Note 14 - Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 12, 2020
Sep. 28, 2020
Aug. 31, 2021
Jul. 31, 2021
Jul. 31, 2020
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 29, 2021
Apr. 30, 2021
Apr. 21, 2021
Sep. 27, 2020
Jun. 09, 2020
Jun. 08, 2020
May 31, 2020
Dec. 31, 2019
Sep. 15, 2017
Common and Preferred Stock, Shares Authorized (in shares)                               350,000,000 179,000,000      
Common Stock, Shares Authorized (in shares)   1,000,000,000.0       2,000,000,000       2,000,000,000 2,000,000,000     2,000,000,000.0   345,000,000        
Preferred Stock, Shares Authorized (in shares)           5,000,000       5,000,000 5,000,000         5,000,000        
Common Stock, Shares, Issued, Total (in shares)           347,240,045       347,240,045 180,096,317                  
Common Stock, Shares, Outstanding, Ending Balance (in shares)           347,233,341       347,233,341 180,089,613               113,346,472  
Dividends Payable, Current           $ 50,000       $ 50,000 $ 49,000                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)           3,150,000       3,150,000                    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 0.10       $ 0.10 $ 0.17               $ 0.14  
Class of Warrant or Right, Exercisable (in shares)           1,466,680       1,466,680                    
Class of Warrant or Right, Outstanding (in shares)           3,150,000       3,150,000 753,775               1,733,856  
Warrants and Rights Outstanding           $ 0       $ 0                    
Warrants or Rights, Issued During Period (in shares)                   3,000,000 0                  
Warrants, Vesting Expense                   $ 41,000                    
Warrants or Rights, Cancelled During Period (in shares)                   603,375 980,081                  
Warrants or Rights, Exercised During Period (in shares)                   400 (0)                  
Warrants or Rights Exercised During Period, Exercise Price (in dollars per share)                   $ 0.01                  
Warrants Expiring Three Years From Initial Vesting [Member]                                        
Class of Warrant or Right, Outstanding (in shares)           150,000       150,000                    
Director Warrants [Member]                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                         200,000              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                         $ 0.07              
Class of Warrant or Right, Outstanding (in shares)                         600,000              
Warrants and Rights Outstanding, Term (Year)                         1 year              
Director Warrants [Member] | Chief Financial Officer [Member]                                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 0.06                                
Warrants or Rights, Issued During Period (in shares)       400,000                                
Director Warrants [Member] | Advisory Board Member [Member]                                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 0.048                                  
Warrants or Rights, Issued During Period (in shares)     200,000                                  
Director Warrants [Member] | Advisory Board Member 2 [Member]                                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 0.07                                  
Warrants or Rights, Issued During Period (in shares)     1,800,000                                  
Minimum [Member]                                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 0.048       $ 0.048                    
Maximum [Member]                                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 0.80       $ 0.80                    
Common Stock Issued to Series A Preferred Stock Holders [Member]                                        
Dividends, Common Stock, Stock                   $ 1,911,587                    
Common Stock Issued to Series B Preferred Stock Holders [Member]                                        
Dividends, Common Stock, Stock                   $ 51,000 $ 51,000                  
Exchange of Series A Preferred Stock for Series A-1 Preferred Stock [Member]                                        
Conversion of Stock, Shares Converted (in shares)         18,828                              
Conversion of Series A Preferred to Common Stock [Member]                                        
Conversion of Stock, Shares Converted (in shares)                   14,911                    
Conversion of Stock, Shares Issued (in shares)                   74,562,000                    
Conversion of Series A-1 Preferred to Common Stock [Member]                                        
Conversion of Stock, Shares Converted (in shares)                   14,782                    
Conversion of Stock, Shares Issued (in shares)                   73,910,000                    
Series A Preferred Stock [Member]                                        
Preferred Stock, Shares Authorized (in shares)           38,000       38,000 38,000                 38,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)           0       0 14,911               37,467  
Preferred Stock, Par or Stated Value Per Share (in dollars per share)           $ 0.01       $ 0.01 $ 0.01                 $ 0.01
Common Stock Rate Exhange From Preferred Stock, Per Month   10.00%                                    
Preferred Stock, Convertible, Conversion Price (in dollars per share)   $ 0.20                         $ 1.15          
Preferred Stock, Dividend Rate, Percentage   8.00%                                    
Preferred Stock, Dividend Rate, Percentage, Stock   10.00%                                    
Preferred Stock, Dividend Rate, Percentage, Liquidiation Preference   4.00%                                    
Dividends Payable           $ 0       $ 0 $ 0                  
Series A-1 Preferred Stock [Member]                                        
Preferred Stock, Shares Authorized (in shares)         31,021 38,000       38,000 38,000                  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)           0       0 14,782                  
Preferred Stock, Par or Stated Value Per Share (in dollars per share)           $ 0.01       $ 0.01 $ 0.01                  
Dividends Payable, Current         $ 1,849,000                              
Preferred Stock, Dividend Rate, Percentage         8.00%                              
Preferred Stock, Dividend Rate, Percentage, Stock         10.00%                              
Preferred Stock, Liquidation Preference Per Share (in dollars per share)         $ 1,000                              
Preferred Stock, Liquidation Preference, Per Share, Percent         115.00%                              
Preferred Stock Dividends, Shares (in shares)                   1,789,587                    
Series B Preferred Stock [Member]                                        
Preferred Stock, Shares Authorized (in shares)           750,000       750,000 750,000                  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)           239,400       239,400 239,400                  
Preferred Stock, Par or Stated Value Per Share (in dollars per share)           $ 0.01       $ 0.01 $ 0.01                  
Conversion of Stock, Shares Converted (in shares)                   0 0                  
Dividends Payable           $ 8,000       $ 8,000 $ 8,000                  
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share)                   $ 0.03 $ 0.03                  
Series C Preferred Stock [Member]                                        
Preferred Stock, Shares Outstanding, Ending Balance (in shares)           0       0                    
Series D Preferred Stock [Member]                                        
Preferred Stock, Shares Outstanding, Ending Balance (in shares)           23,216 22,965 22,958 22,757 23,216 22,863                  
Preferred Stock, Par or Stated Value Per Share (in dollars per share)                       $ 0.01           $ 0.01    
Conversion of Stock, Shares Converted (in shares)           (0) 242 50 354                      
Preferred Stock, Convertible, Conversion Price (in dollars per share) $ 0.0583                                      
Preferred Stock, Dividend Rate, Percentage 4.00%                                      
Conversion of Stock, Shares Issued (in shares)           251 249 251 248