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Note 15 - Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 08, 2020
May 14, 2020
May 12, 2020
Apr. 02, 2020
Feb. 14, 2020
Mar. 28, 2019
Sep. 23, 2015
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 12, 2020
Dec. 31, 2019
Aug. 24, 2018
Aug. 23, 2018
Nov. 11, 2015
Nov. 13, 2014
Preferred Stock, Shares Authorized (in shares)               5,000,000     5,000,000              
Preferred Stock, Par or Stated Value Per Share (in dollars per share)               $ 0.0001     $ 0.0001              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 0.65                       $ 3.60  
Dividends, Paid-in-kind, Total         $ 41,688       $ 112,686            
Director [Member]                                    
Stock Issued During Period, Shares, Issued for Services (in shares) 1,581 1,632 7,077 6,850   13,820     0                  
Stock Issued During Period, Value, Issued for Services $ 1,502 $ 1,501 $ 7,003 $ 5,001   $ 16,506                        
A New Employee [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       5,000                            
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)       $ 0.73                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Intrinsic Value       $ 2,267                            
A New Employee [Member] | Share-based Payment Arrangement, Option [Member]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       3 years                            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       7 years                            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate       0.36%                            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)       4 years 182 days                            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate       0.00%                            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate       83.00%                            
Convertible Note Due in July 13, 2020 [Member]                                    
Debt Instrument, Convertible, Conversion Price (in dollars per share)         $ 1.15                          
September 2015 Warrants [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         384,618                   166,668 69,445    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                             $ 1.50 $ 3.60    
Referral Fee Warrants [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               125,000     125,000              
Warrants and Rights Outstanding               $ 94,655     $ 94,655              
Promissory Note [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             69,445                      
Amended Note [Member] | Senior Secured Convertible Note [Member]                                    
Debt Instrument, Convertible, Conversion Price (in dollars per share)         $ 0.65               $ 0.65          
Private Investor SPA [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                                   996,877
Series A-1 Convertible Preferred Stock [Member]                                    
Preferred Stock, Shares Authorized (in shares)               100,000     100,000              
Series B-1 Convertible Preferred Stock [Member]                                    
Preferred Stock, Shares Authorized (in shares)               105,000     105,000              
Preferred Stock, Shares Outstanding, Ending Balance (in shares)               0     0     0        
September 2015 Warrants [Member]                                    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 3.60                      
Term Of Warrant (Year)             5 years