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Note 13 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
May 14, 2019
Mar. 28, 2019
Aug. 24, 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, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
May 31, 2018
Dec. 31, 2015
Preferred Stock, Shares Authorized                           5,000,000       5,000,000      
Preferred Stock, Par or Stated Value Per Share                           $ 0.0001       $ 0.0001      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total                           $ 5,505 $ 16,506 $ 6,509 $ 16,513        
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 3.60                                  
Promissory Note [Member]                                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights           69,445                              
Securities Purchase Agreement Warrants [Member]                                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     2,392,502                                    
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 1.50                                    
Fair Value Adjustment of Warrants     $ 1,288,139                                    
September 2015 Warrants [Member]                                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     166,668                                    
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 1.50                                    
Fair Value Adjustment of Warrants     $ 140,827                                    
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]                                          
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total 4,235 13,820                                      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total $ 5,505 $ 16,506                                      
Certain Officers, Employees, and Contractors [Member] | Share-based Payment Arrangement, Option [Member]                                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                           0       235,334      
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      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                                   $ 1.18      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value Amount                                   $ 243,643      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                                   2.35%      
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%      
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  
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                         131,229                
Conversion of Dividends Payable, Amount Converted                         $ 472,426         $ 472,426    
Series A-1 Convertible Preferred Stock [Member]                                          
Preferred Stock, Shares Authorized                           100,000       100,000      
Stock Issued During Period, Shares, New Issues       5,500 84,500                               90,000
Preferred Stock, Shares Outstanding, Ending Balance                           0       0      
Share Price       $ 100 $ 100                                
Proceeds from Issuance of Convertible Preferred Stock       $ 550,000 $ 8,450,000                                
Conversion of Dividends Payable, Amount Converted               $ 25,463 $ 330,552   $ 540,000                  
Preferred Stock, Shares Issued, Total                           0       0      
Series B-1 Convertible Preferred Stock [Member]                                          
Preferred Stock, Shares Authorized                           105,000       105,000      
Stock Issued During Period, Shares, New Issues       105,000                                 105,000
Preferred Stock, Shares Outstanding, Ending Balance                           0       0      
Share Price       $ 100                                  
Proceeds from Issuance of Convertible Preferred Stock       $ 10,500,000                                  
Conversion of Dividends Payable, Amount Converted               $ 55,342   $ 417,084                      
Preferred Stock, Shares Issued, Total                           0       0      
September 2015 Warrants [Member]                                          
Term Of Warrant           5 years                              
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 3.60