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Note 9 - Stockholder's Equity (Details Textual)
1 Months Ended 4 Months Ended 12 Months Ended
Apr. 30, 2015
$ / shares
Dec. 02, 2014
USD ($)
shares
Oct. 21, 2014
USD ($)
$ / shares
shares
Jul. 10, 2014
USD ($)
$ / shares
shares
Jun. 13, 2014
$ / shares
shares
May. 21, 2014
USD ($)
$ / shares
shares
May. 06, 2014
$ / shares
shares
Apr. 29, 2014
USD ($)
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Apr. 29, 2015
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Sep. 30, 2015
$ / shares
Dec. 31, 2013
shares
Dec. 31, 2012
shares
Notes Payable Dated July 9, 2012 Issued to Investor One [Member]                              
Debt Conversion, Converted Instrument, Shares Issued   7,764                          
Note Payable to High Yield Fund [Member]                              
Debt Conversion, Converted Instrument, Shares Issued           259,236                  
Debt Conversion, Original Debt, Amount | $           $ 500,000                  
Notes payable Dated July 9, 2012 Issued to Investor Two [Member]                              
Debt Conversion, Converted Instrument, Shares Issued   7,764                          
Notes Payable to 11 Investors [Member]                              
Debt Conversion, Original Debt, Amount | $   $ 50,000                          
Debt Instrument, Number of Investors Converting Debt   2                          
Director Stock Options [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                       3 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                     0 438,131      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares                       $ 3.70      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                       10 years      
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, Options, Grants in Period, Gross                     6,650 2,849,050      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares                     $ 1.90 $ 3.70      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                     10 years        
Investors [Member] | Warrants to Purchase Common Stock [Member]                              
Class of Warrant or Right, Term       4 years 4 years 4 years 4 years 4 years              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       15,000 533,625 261,693 1,025,438 832,950              
Number of Shares of Common Stock Consisted in Unit       1 1 1 1 1              
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right       0.3 0.3 0.3 0.3 0.3              
Share Price | $ / shares       $ 4 $ 4 $ 4 $ 4 $ 4              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 4.80 $ 4.80 $ 4.80 $ 4.80 $ 4.80              
Placement Agent [Member] | Warrants to Purchase Common Stock [Member]                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       5,000 177,875 89,731 341,813 277,650              
Placement Agent [Member] | Common Stock Warrants Issued April 29, 2014 [Member] | Tranche Three [Member]                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights               35,000              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares               $ 4.80              
A Law Firm [Member] | Warrants to Purchase Common Stock [Member]                              
Warrant Expense | $                       $ 24,393      
Independent Consultant [Member] | Warrants to Purchase Common Stock [Member]                              
Class of Warrant or Right, Term                       5 years      
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                 $ 4.90     $ 4.90      
Warrant Expense | $                       $ 25,976      
Class of Warrant or Right Vesting Period                       1 year      
Adjustments to Additional Paid in Capital, Change in Fair Value of Warrants Issued | $                     $ (516)        
Investor Relations Firm [Member] | Common Stock Warrants [Member] | General and Administrative Expense [Member]                              
Warrant Expense | $                     496,010 $ 21,566      
Investor Relations Firm [Member] | Common Stock Warrants [Member]                              
Class of Warrant or Right, Term                 5 years            
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                 $ 3.75     $ 3.75      
Term of Agreement with Counterparty                 1 year            
Warrants and Rights Outstanding | $                     $ 517,576        
Warrants to Purchase Common Stock [Member] | Convertible Notes Payable [Member] | Board of Directors Chairman [Member] | Financing Transaction [Member]                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights               351,060              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares               $ 2              
Warrants to Purchase Common Stock [Member] | Financing Transaction [Member] | Director [Member]                              
Warrant Expense | $                       $ 107,395      
Convertible Notes Payable [Member] | Board of Directors Chairman [Member] | Financing Transaction [Member]                              
Stock Issued During Period, Shares, Issued to Chairman in Connection with Settlement of Outstanding Debt               546,553              
Number of Convertible Promissory Notes Converted               4              
Debt Conversion, Original Debt, Amount | $               $ 1,050,000              
Gains (Losses) on Extinguishment of Related Party Debt | $               $ (1,650,378)              
Convertible Notes Payable [Member] | Financing Transaction [Member] | Director [Member]                              
Debt Conversion, Converted Instrument, Shares Issued     100,000                 100,000      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     75,000                        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 4.80                        
Debt Conversion, Original Debt, Amount | $     $ 200,000                 $ 200,000      
Gains (Losses) on Extinguishment of Related Party Debt | $     $ (257,394)                        
Common Stock, Shares, Issued                 18,614,968   18,614,968 18,614,968      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                     6,650 3,287,181      
Preferred Stock, Shares Authorized                     5,000,000        
Preferred Stock, Par or Stated Value Per Share | $ / shares                     $ 0.001        
Common Stock, Shares Authorized                 1,000,000,000   1,000,000,000 1,000,000,000      
Common Stock, Par or Stated Value Per Share | $ / shares                 $ 0.001   $ 0.001 $ 0.001      
Common Stock, Shares, Outstanding                 18,614,968   18,614,968 18,614,968     890,837
Stock Issued During Period, Shares, New Issues       50,000 1,778,750 872,310 3,418,125 2,776,500              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                     4,781,574        
Share Price | $ / shares $ 2.80                   $ 1   $ 0.90    
Proceeds from Issuance of Private Placement | $       $ 35,600,000                      
Net Proceeds from Issuance of Private Placement | $       31,900,000                      
Payments of Placement Agent Fees in Private Placement | $       3,600,000                      
Payments of Estimated Offering Expenses in Private Placement | $       $ 100,000                      
Number of Shares of Common Stock for Which Registration Statement is Filed for Offering and Resale of Common Stock       11,633,885                      
Gains (Losses) on Extinguishment of Related Party Debt | $                     $ (1,907,772)      
Gain (Loss) on Settlement of Notes Payable | $   $ (400,016)                 $ (400,016)      
Stock Issued During Period, Shares, Issued to Creditors in Connection with Settlement of Debt                       160,056      
Stock Issued During Period, Shares, Issued to Law Firm in Connection with Conversion of Outstanding Debt                       53,457      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number                 3,648,247   3,011,498 3,648,247   389,436  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number                 1,072,111   1,861,952 1,072,111   367,110  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares                     $ 1.90 $ 3.71      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 1 year                 90 days          
Adjustments to Additional Paid in Capital, Change in Fair Value of Warrants Issued | $                     $ (516)