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Note 10 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Mar. 28, 2018
Mar. 23, 2018
Oct. 17, 2017
Sep. 22, 2017
Nov. 11, 2015
Oct. 29, 2015
Sep. 23, 2015
Nov. 13, 2014
Mar. 31, 2018
Oct. 31, 2017
Sep. 30, 2017
Mar. 31, 2018
Mar. 31, 2017
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    
Initial Conversion Price   $ 3.60                        
Conversion of Dividends Payable, Amount Converted   $ 417,084   $ 540,000               $ 417,084  
Conversion of Dividends Payable, Shares Issued   115,857   150,000                    
Shares Issued, Price Per Share       $ 3.60                    
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 3.60                  
Preferred Stock, Conversion Price                       $ 3.60    
Equity Facility, Aggregate Sales Limitation, Percentage of Total Outstanding Share   19.99%                        
Stock Issued During Period, Shares, Conversion of Convertible Securities   1,794,191                        
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, Exercise Price of Warrants or Rights               $ 3.60            
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            
Director [Member]                            
Stock Issued During Period, Shares, Issued for Services 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 Converted     27,404                      
Conversion of Stock, Shares Issued     761,222                      
Conversion of Series B-1 Shares into Common Stock [Member]                            
Conversion of Stock, Shares Converted   60,420                        
Conversion of Stock, Shares Issued   1,678,334                        
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 Outstanding, Ending Balance                 62,596     62,596   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                   $ 540,000      
Conversion of Stock, Shares Converted                   27,404      
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 3.60                      
Preferred Stock, Shares Issued, Total                 62,596     62,596   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 Outstanding, Ending Balance                 44,580     44,580   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                  
Conversion of Dividends Payable, Amount Converted                 $ 417,084          
Conversion of Stock, Shares Converted                 60,420          
Preferred Stock, Shares Issued, Total                 44,580     44,580   105,000
Series B-1 Convertible Preferred Stock [Member] | Maximum [Member]                            
Maximum Ownership as a Result of Conversion         9.99%                  
September 2015 Warrants [Member]                            
Class of Warrant or Right, Exercise Price of Warrants or Rights             $ 3.60              
Term Of Warrant             5 years