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Note 10 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 8 Months Ended
May 31, 2018
May 23, 2018
May 14, 2018
May 10, 2018
Apr. 03, 2018
Mar. 28, 2018
Mar. 23, 2018
Nov. 11, 2015
Oct. 29, 2015
Sep. 23, 2015
Nov. 13, 2014
May 31, 2018
Apr. 30, 2018
Mar. 31, 2018
Oct. 31, 2017
Sep. 30, 2017
May 23, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
May 31, 2018
Dec. 31, 2017
Preferred Stock, Shares Authorized                                   5,000,000   5,000,000      
Preferred Stock, Par or Stated Value Per Share                                   $ 0.0001   $ 0.0001      
Stock Issued During Period, Shares, Conversion of Convertible Securities             1,794,191                                
Class of Warrant or Right, Exercise Price of Warrants or Rights               $ 3.60                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                                   0          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value Amount                                     $ 381,876        
Employee Stock Option [Member]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                                     2.56%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term                                     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                                     143.00%        
Promissory Note [Member]                                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                   69,445                          
Private Investor SPA [Member]                                              
Stock Issued During Period, Shares, New Issues                     664,584                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                     996,877                        
Proceeds from Issuance of Private Placement                     $ 1,595,000                        
Term Of Warrant                     5 years                        
Class of Warrant or Right, Exercise Price of Warrants or Rights                     $ 3.60                        
Director [Member]                                              
Stock Issued During Period, Shares, Issued for Services     648 2,035   762 7,659                                
Stock Issued During Period, Value, Issued for Services           $ 1,501 $ 15,011                                
Six Non-Employee Members of the Board of Directors [Member]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             9,000                                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price             $ 1.96                                
Six Non-Employee Members of the Board of Directors [Member] | Employee Stock Option [Member]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             3 years                                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             7 years                                
Certain Officers, Employees, and Contractors [Member]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             212,918                                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price             $ 1.96                                
Certain Officers, Employees, and Contractors [Member] | Employee Stock Option [Member]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             3 years                                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             7 years                                
Conversion of Series A-1 Shares into Common Stock [Member]                                              
Conversion of Stock, Shares Issued                                           2,500,000  
Conversion of Dividends Payable on Series A-1 Preferred Stock to Common Stock [Member]                                              
Conversion of Dividends Payable, Shares Issued                                           248,893  
Conversion of Dividends Payable, Amount Converted                                       $ 356,015 $ 896,015  
Stock Issued During Period, Shares, Conversion of Convertible Securities 660,073       1,177,598                                    
Conversion of Series B-1 Shares into Common Stock [Member]                                              
Conversion of Stock, Shares Issued                                 2,916,668            
Conversion of Dividends Payable on Series B-1 Preferred Stock to Common Stock [Member]                                              
Conversion of Dividends Payable, Shares Issued                                 131,230            
Conversion of Dividends Payable, Amount Converted                                 $ 472,426     $ 472,426    
Stock Issued During Period, Shares, Conversion of Convertible Securities   1,253,707                                          
Series A-1 Convertible Preferred Stock [Member]                                              
Preferred Stock, Shares Authorized                                   100,000   100,000     100,000
Preferred Stock, Par or Stated Value Per Share                                   $ 0.0001   $ 0.0001     $ 0.0001
Preferred Stock, Shares Issued, Total                                   0   0     62,596
Stock Issued During Period, Shares, New Issues               5,500 84,500                            
Share Price               $ 100 $ 100                            
Proceeds from Issuance of Convertible Preferred Stock               $ 550,000 $ 8,450,000                            
Initial Conversion Price               $ 3.60                              
Conversion Cap               35.00%                              
Preferred Stock, Dividend Rate, Percentage               6.00%                              
Period Preceding the Dividend Payment Date               10 days                              
Liquidation Value Per Share               $ 100                              
Conversion of Dividends Payable, Amount Converted                       $ 25,463 $ 330,552   $ 540,000              
Preferred Stock, Shares Outstanding, Ending Balance                                   0   0     62,596
Series A-1 Convertible Preferred Stock [Member] | Maximum [Member]                                              
Maximum Ownership as a Result of Conversion               9.99%                              
Series B-1 Convertible Preferred Stock [Member]                                              
Preferred Stock, Shares Authorized                                   105,000   105,000     105,000
Preferred Stock, Par or Stated Value Per Share                                   $ 0.0001   $ 0.0001     $ 0.0001
Preferred Stock, Shares Issued, Total                                   0   0     105,000
Stock Issued During Period, Shares, New Issues               105,000                              
Share Price               $ 100                              
Proceeds from Issuance of Convertible Preferred Stock               $ 10,500,000                              
Initial Conversion Price               $ 3.60                              
Preferred Stock, Dividend Rate, Percentage               2.50%                              
Period Preceding the Dividend Payment Date               10 days                              
Liquidation Value Per Share               $ 100                              
Equity Facility, Aggregate Sales Limitation, Percentage of Total Outstanding Share               19.99%                              
Conversion of Dividends Payable, Amount Converted                       $ 55,342   $ 417,084                  
Preferred Stock, Shares Outstanding, Ending Balance                                   0   0     105,000
Series B-1 Convertible Preferred Stock [Member] | Maximum [Member]                                              
Maximum Ownership as a Result of Conversion               9.99%                              
September 2015 Warrants [Member]                                              
Term Of Warrant                   5 years                          
Class of Warrant or Right, Exercise Price of Warrants or Rights                   $ 3.60