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Note 9 - Stockholders' Equity (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 22, 2017
USD ($)
$ / shares
shares
Aug. 09, 2017
USD ($)
$ / shares
shares
May 11, 2017
USD ($)
shares
May 02, 2017
USD ($)
$ / shares
Apr. 28, 2017
USD ($)
$ / shares
shares
Apr. 10, 2017
$ / shares
shares
Mar. 16, 2017
$ / shares
shares
Mar. 15, 2017
USD ($)
$ / shares
shares
Dec. 29, 2016
Aug. 10, 2016
USD ($)
shares
May 11, 2016
USD ($)
shares
Mar. 08, 2016
USD ($)
shares
Nov. 11, 2015
USD ($)
$ / shares
shares
Oct. 29, 2015
USD ($)
$ / shares
shares
Sep. 23, 2015
USD ($)
$ / shares
shares
Mar. 09, 2015
$ / shares
shares
Nov. 13, 2014
USD ($)
$ / shares
shares
Nov. 08, 2013
USD ($)
shares
Oct. 25, 2013
$ / shares
shares
May 31, 2017
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
shares
Jun. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
shares
Aug. 07, 2017
Dec. 31, 2016
USD ($)
$ / shares
shares
Nov. 30, 2016
$ / shares
Preferred Stock, Shares Authorized | shares                                         5,000,000     5,000,000        
Preferred Stock, Par or Stated Value Per Share | $ / shares                                         $ 0.0001     $ 0.0001        
Initial Conversion Price | $ / shares $ 3.60                                                      
Maximum Ownership as a Result of Conversion                                                   9.99%    
Conversion of Dividends Payable, Amount Converted $ 540,000                                             $ 540,000      
Conversion of Dividends Payable, Shares Issued | shares 150,000                                                      
Dividends Payable                                         $ 601,875 $ 200,625   601,875 200,625      
Stock Issued During Period, Shares, Issued for Services | shares                                       61,667                
Stock Issued During Period, Value, Issued for Services                                       $ 156,584                
Proceeds from Issuance of Common Stock                                               $ 2,000,000      
Committed Equity Facility Amount       $ 5,000,000                                                
Committed Equity Facility, Term       3 years                                                
Maximum Dollar Amount of Shares to Purchase Based on Daily Volume Weighted Average Price of the Company’s Common Stock       $ 100,000                                                
Period for Maximum Dollar Amount of Shares to Purchase       5 days                                                
Percentage of Lowest VWAP That Equals or Exceeds Specified per Share Price under Committed Equity Facility       94.00%                                                
Per Share Price That Is Used in Calculation for Purchase Price under Committed Equity Facility | $ / shares       $ 3.83                                                
Equity Facility, Aggregate Sales Limitation, Percentage of Total Outstanding Share       19.99%                                                
Maximum Ownership of Company’s Common Stock Requirement under Committed Equity Facility Sale, Percentage       9.99%                                                
Stock Issued During Period As a Commitment Fee, Shares | shares                                       55,000                
Stock Issued During Period As a Commitment Fee, Value                                       $ 198,000                
Stock Issued During Period, Issued for Services, Weighted Average Share Price | $ / shares                                       $ 2.54                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                               47,917                        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                               $ 2.52                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares                                         4,167 0   4,167 0      
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures | shares                                               1,610        
Payments of Stock Issuance Costs                                             $ 80,366 $ 80,366 $ 32,620      
Term Of Warrant                               1 year                        
Class of Warrant or Right, Nonemployee Compensation Expense                                           $ 0     11,625      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value Amount                                               $ 20,538        
Employee Stock Option [Member]                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                                               1.81%        
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                                               138.00%        
September 2015 Warrants [Member]                                                        
Debt Instrument, Unamortized Discount                             $ 92,199                          
Fair Value Adjustment of Warrants                                           56,017     4,607      
Warrants and Rights Outstanding                                                     $ 0  
September 2017 [Member]                                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 138,889                                                      
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 3.60                                                      
Term Of Warrant 5 years                                                      
Promissory Note [Member]                                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                             69,445                          
Warrants Issued Under PISPA [Member]                                                        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings                                           $ 4,368     $ 6,272      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value                                                     $ 0  
Fair Value, Inputs, Level 3 [Member] | Warrants Issued Under PISPA [Member]                                                        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances                                   $ 325,891                    
Private Investor SPA [Member]                                                        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                                     $ 6                  
Stock Issued During Period, Value, New Issues                                   $ 3,697,100                    
Term Of Warrant                                   3 years                    
Placement Agent Warrants [Member]                                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                                   82,158                    
Commissions and Fees, Percent of Gross Proceeds                                   8.00%                    
Private Investor SPA [Member]                                                        
Stock Issued During Period, Shares, New Issues | shares                                 664,584   1,026,972                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                                 996,877                      
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                                 $ 3.60                     $ 3.60
Term Of Warrant                                 5 years                      
Proceeds from Issuance of Private Placement                                 $ 1,595,000                      
Private Investor SPA [Member] | Common Stock [Member]                                                        
Stock Issued During Period, Shares, New Issues | shares                                     1,026,972                  
Private Investor SPA [Member] | Warrant [Member]                                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                                     1,026,972                  
Director [Member]                                                        
Stock Issued During Period, Shares, Issued for Services | shares   5,148 1,925         1,895   3,125 3,431 8,333                                
Stock Issued During Period, Value, Issued for Services   $ 18,018 $ 5,005         $ 5,003   $ 9,000 $ 6,999 $ 16,000                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | shares           10,000                                            
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares           $ 2.64                                            
Director [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                                            
Director and Executive Officer [member]                                                        
Stock Issued During Period, Shares, New Issues | shares 427,778       277,778                                              
Share Price | $ / shares         $ 3.60                                              
Conversion of Dividends Payable, Amount Converted $ 540,000                                                      
Proceeds from Issuance of Common Stock $ 1,000,000       $ 1,000,000                                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 138,889                                                      
Stock and Warrants Issued During Period, Vaue $ 1,540,000                                                      
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 3.60                                                      
Chief Executive Officer [Member]                                                        
Stock Issued During Period, Shares, Issued for Services | shares                     8,333                                  
Stock Issued During Period, Value, Issued for Services                     $ 17,000                                  
Four Members of the Board of Directors [Member]                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | shares               40,000                                        
Employee [Member]                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | shares               4,167                                        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares               $ 2.64                                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value Amount                                               $ 100,602        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                                               1.91%        
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                                               138.00%        
Employee [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, Net of Forfeitures | shares   60,000         1,120,000                                          
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 | $ / shares   $ 3.50         $ 2.65                                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value Amount                                         $ 179,220     $ 2,560,081        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                                         1.73%              
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%     0.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate                                         135.00%     138.00%        
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                                          
Reverse Stock Split [Member]                                                        
Stockholders' Equity Note, Stock Split, Conversion Ratio                 12                                      
Maximum [Member] | Certain Officers, Employees, and Contractors [Member]                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                                               2.11%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term                                               7 years        
Minimum [Member] | Certain Officers, Employees, and Contractors [Member]                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                                               1.91%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term                                               4 years 182 days        
Series A-1 Convertible Preferred Stock [Member]                                                        
Preferred Stock, Shares Authorized | shares                                         100,000     100,000     100,000  
Preferred Stock, Par or Stated Value Per Share | $ / shares                                         $ 0.0001     $ 0.0001     $ 0.0001  
Preferred Stock, Shares Outstanding | shares                                         90,000     90,000     90,000  
Stock Issued During Period, Shares, New Issues | shares                         5,500 84,500                            
Share Price | $ / shares                         $ 100 $ 100                            
Proceeds from Issuance of Convertible Preferred Stock                         $ 550,000 $ 8,450,000                            
Initial Conversion Price | $ / shares                         $ 3.60 $ 3.60                            
Preferred Stock, Dividend Rate, Percentage                         6.00%                              
Period Preceding the Dividend Payment Date                         10 days                              
Liquidation Value Per Share | $ / shares                         $ 100                              
Dividends Payable                                         $ 135,000     $ 135,000     $ 270,000  
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 | shares                                         105,000     105,000     105,000  
Preferred Stock, Par or Stated Value Per Share | $ / shares                                         $ 0.0001     $ 0.0001     $ 0.0001  
Preferred Stock, Shares Outstanding | shares                                         105,000     105,000     105,000  
Stock Issued During Period, Shares, New Issues | shares                         105,000                              
Share Price | $ / shares                         $ 100                              
Proceeds from Issuance of Convertible Preferred Stock                         $ 10,500,000                              
Preferred Stock, Dividend Rate, Percentage                         2.50%                              
Period Preceding the Dividend Payment Date                         10 days                              
Liquidation Value Per Share | $ / shares                         $ 100                              
Dividends Payable                                         $ 328,125     $ 328,125     $ 131,250  
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 | $ / shares                             $ 3.60                          
Term Of Warrant                             5 years