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Note 9 - Stockholders' Equity (Details Textual)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 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. 31, 2016
USD ($)
$ / shares
shares
Dec. 29, 2016
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
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
Nov. 30, 2016
$ / shares
Preferred Stock, Par or Stated Value Per Share | $ / shares $ 0.0001                                     $ 0.0001   $ 0.0001    
Preferred Stock, Shares Authorized | shares 5,000,000                                     5,000,000   5,000,000    
Stock Issued During Period As a Commitment Fee, Shares | shares                                     55,000          
Stock Issued During Period As a Commitment Fee, Value | $                                     $ 198,000          
Proceeds from Issuance of Common Stock | $                                           $ 1,000,000  
Committed Equity Facility Amount | $     $ 5                                          
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, Shares, Issued for Services | shares                                     61,667          
Stock Issued During Period, Issued for Services, Weighted Average Share Price | $ / shares                                     $ 2.54          
Stock Issued During Period, Value, Issued for Services | $                                     $ 156,584          
Payments of Stock Issuance Costs | $                                       $ 74,420   80,366 32,619  
Dividends Payable | $ $ 401,250                                     $ 401,250 $ 200,625 401,250 200,625  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                             $ 2.52                  
Class of Warrant or Right, Nonemployee Compensation Expense | $                                             11,625  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                             47,917                  
Term Of Warrant                             1 year                  
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 | $                                         49,035   51,410  
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 | $                                         $ (433)   $ 1,904  
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]                                                
Stock Issued During Period, Value, New Issues | $                                 $ 3,697,100              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                                   $ 6            
Term Of Warrant                                 3 years              
Placement Agent Warrants [Member]                                                
Commissions and Fees, Percent of Gross Proceeds                                 8.00%              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                                 82,158              
Private Investor SPA [Member]                                                
Stock Issued During Period, Shares, New Issues | shares                               664,584   1,026,972            
Proceeds from Issuance of Private Placement | $                               $ 1,595,000                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                               $ 3.60               $ 3.60
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                               996,877                
Term Of Warrant                               5 years                
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 and Executive Officer [member]                                                
Proceeds from Issuance of Common Stock | $       $ 1,000,000                                        
Stock Issued During Period, Shares, New Issues | shares       277,778                                        
Share Price | $ / shares       $ 3.60                                        
Director [Member]                                                
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures | shares             1,895       8,333                          
Stock Granted, Value, Share-based Compensation, Net of Forfeitures | $             $ 5,003       $ 16,000                          
Stock Issued During Period, Shares, Issued for Services | shares   1,925               41,174                            
Stock Issued During Period, Value, Issued for Services | $   $ 5,005               $ 6,999                            
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, Net of Forfeitures | shares         10,000                                      
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                                      
Chief Executive Officer [Member]                                                
Stock Issued During Period, Shares, Issued for Services | shares                   100,000                            
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 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, Net of Forfeitures | shares             4,167                                  
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 Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares           $ 2.65                                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | shares           1,120,000                                    
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             12 12                              
Series A-1 Convertible Preferred Stock [Member]                                                
Preferred Stock, Par or Stated Value Per Share | $ / shares $ 0.0001             $ 0.0001                       $ 0.0001   $ 0.0001    
Preferred Stock, Shares Authorized | shares 100,000             100,000                       100,000   100,000    
Preferred Stock, Shares Outstanding | shares 90,000             90,000                       90,000   90,000    
Preferred Stock, Dividend Rate, Percentage                       6.00%                        
Period Preceding the Dividend Payment Date                       10 days                        
Liquidation Value Per Share | $ / shares                       $ 100                        
Dividends Payable | $ $ 540,000             $ 270,000                       $ 540,000   $ 540,000    
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                      
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, Par or Stated Value Per Share | $ / shares $ 0.0001             $ 0.0001                       $ 0.0001   $ 0.0001    
Preferred Stock, Shares Authorized | shares 105,000             105,000                       105,000   105,000    
Preferred Stock, Shares Outstanding | shares 105,000             105,000                       105,000   105,000    
Preferred Stock, Dividend Rate, Percentage                       2.50%                        
Period Preceding the Dividend Payment Date                       10 days                        
Liquidation Value Per Share | $ / shares                       $ 100                        
Dividends Payable | $ $ 262,500             $ 131,250                       $ 262,500   $ 262,500    
Stock Issued During Period, Shares, New Issues | shares                       105,000                        
Share Price | $ / shares                       $ 100                        
Proceeds from Issuance of Convertible Preferred Stock | $                       $ 10,500,000                        
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 | $ / shares                           $ 3.60                    
Term Of Warrant                           5 years