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Note 5 - Equity (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2019
shares
Sep. 20, 2018
shares
Aug. 01, 2018
$ / shares
shares
Jun. 30, 2018
shares
May 09, 2018
USD ($)
$ / shares
shares
Apr. 03, 2018
USD ($)
$ / shares
shares
Apr. 30, 2018
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
$ / shares
shares
Sep. 25, 2019
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Jan. 29, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares               $ 4.60             $ 4.60   $ 4.60   $ 5.17
Proceeds from Issuance of Common Stock | $                             $ 15,174,581      
Stock Issued During Period, Shares, Issued for Services                             253,707   200,009    
Stock Issued During Period, Value, Issued for Services | $               $ 40,935 $ 159,101 $ 192,396 $ 176,650 $ 176,650   $ 392,432   $ 553,303    
Preferred Stock, Shares Authorized           10,000,000   10,000,000         10,000,000   10,000,000   10,000,000    
Preferred Stock, Par or Stated Value Per Share | $ / shares           $ 0.001   $ 0.001         $ 0.001   $ 0.001   $ 0.001    
Preferred Stock, Shares Outstanding, Ending Balance               0             0   0    
Non-voting To Voting Common Stock, Conversion Ratio           1                          
Common Stock, Shares Authorized           200,000,000   200,000,000         200,000,000   200,000,000   200,000,000    
Common Stock, Par or Stated Value Per Share | $ / shares           $ 0.001   $ 0.001         $ 0.001   $ 0.001   $ 0.001    
Common Stock, Shares, Outstanding, Ending Balance               15,842,855             15,842,855   15,239,148    
Class of Warrant or Right, Issued in Period                             0   3,166,492    
Class of Warrant or Right, Issued During Period, Exercise Price | $ / shares                               $ 4.47    
Class of Warrant or Right, Exercised During Period                               34,615    
Class of Warrant or Right, Cancelled During Period                               15,385    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance               5,905,583             5,905,583   4,535,681   2,628,749
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                             1,461,715   2,034,525    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares               $ 2.94             $ 2.94   $ 3.31   $ 1.31
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total                             91,813        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                             10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term                             7 years 233 days   7 years 302 days    
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $                                 $ 4,500,000    
Share-based Payment Arrangement, Expense | $                             $ 2,900,000        
Graded Vesting Method [Member]                                      
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $                                 3,300,000    
Cliff Vesting Method [Member]                                      
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $                                 $ 1,200,000    
Share-based Payment Arrangement, Option [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                             1,461,715        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                                 3 years    
Share-based Payment Arrangement, Expense | $                             $ 2,500,000        
Performance Shares [Member]                                      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $                                 $ 2,600,000    
Performance Shares [Member] | Share-based Payment Arrangement, Tranche One [Member]                                      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                                 335 days    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $                                 $ 1,300,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                                 50.00%    
Performance Shares [Member] | Share-based Payment Arrangement, Tranche Two [Member]                                      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                                 2 years 153 days    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $                                 $ 1,300,000    
The 2018 Equity Incentive Plan [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant           4,160,000                          
Share Based Compensation Arrangement By Share Based Payment Award, Percentage Applied on Outstanding Shares of Common Stock For Automatically Increase on Each Year           5.00%                          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 761,957                                    
The 2009 Plan [Member]                                      
Common Stock, Capital Shares Reserved for Future Issuance           554,963                          
The 2018 Employee Stock Purchase Plan [Member]                                      
Share Based Compensation Arrangement By Share Based Payment Award, Percentage Applied on Outstanding Shares of Common Stock For Automatically Increase on Each Year               2.00%             2.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               208,500             208,500        
World Wide Holdings, LLC [Member]                                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   50,000                                  
Class of Warrant or Right, Exercised During Period   34,615                                  
Class of Warrant or Right, Cancelled During Period   15,385                                  
Warrants Issued to Underwriter [Member]                                      
Class of Warrant or Right, Issued in Period                                 38,400    
Class of Warrant or Right, Issued During Period, Exercise Price | $ / shares                                 $ 6.25    
Warrants Issued to Investors to Purchase Common Stock [Member]                                      
Class of Warrant or Right, Issued in Period                                 2,283,740    
Class of Warrant or Right, Issued During Period, Exercise Price | $ / shares                                 $ 4.25    
Warrants Issued for Services [Member]                                      
Class of Warrant or Right, Issued in Period                                 844,352    
Warrants and Rights Outstanding | $                                 $ 2,203,506    
Warrants Issued for Services [Member] | Cancer Revolution, LLC [Member]                                      
Class of Warrant or Right, Issued in Period                                 425,000    
Warrants Issued for Services [Member] | Cancer Biotech, LLC [Member]                                      
Class of Warrant or Right, Issued in Period                                 225,000    
Warrants Issued for Services [Member] | Inception Capital Management, LLC [Member]                                      
Class of Warrant or Right, Issued in Period                                 144,352    
Warrants Issued for Services [Member] | World Wide Holdings, LLC [Member]                                      
Class of Warrant or Right, Issued in Period                                 50,000    
Class of Warrant or Right, Issued During Period, Exercise Price | $ / shares                                 $ 5    
Warrants Issued for Services [Member] | FundAthena, Inc [Member]                                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                                   6,000  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                                   $ 5  
Class of Warrant or Right, Issued in Period                             0        
Accounts Payable, Total | $                                   $ 30,000  
Conversion of Preferred Stock to Common Stock [Member]                                      
Conversion of Stock, Shares Converted       1,394,953                              
Conversion of Stock, Shares Issued       9,324,177     1,235,219                        
Maximum [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares               $ 9.80             $ 9.80        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                             4 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value | $ / shares                             $ 7.93        
Maximum [Member] | Share-based Payment Arrangement, Option [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares               1.62             1.62        
Minimum [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares               0.001             $ 0.001        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                             1 year        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value | $ / shares                             $ 0.001        
Minimum [Member] | Share-based Payment Arrangement, Option [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares               $ 1.45             $ 1.45        
Weighted Average [Member] | Share-based Payment Arrangement, Option [Member] | Graded Vesting Method [Member]                                      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                                 2 years 124 days    
Weighted Average [Member] | Share-based Payment Arrangement, Option [Member] | Cliff Vesting Method [Member]                                      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                                 251 days    
IPO [Member]                                      
Stock Issued During Period, Shares, New Issues           1,280,000                          
Sale of Stock, Price Per Share | $ / shares           $ 5                          
Proceeds from Issuance Initial Public Offering | $           $ 5,025,000                          
Payments of Stock Issuance Costs | $           $ 895,000                          
Percentage of Common Stock Issuance of Warrant or Right Issued           3.00%                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights           38,400                          
Private Placement [Member]                                      
Stock Issued During Period, Shares, New Issues         828,500                 350,000 350,000        
Sale of Stock, Price Per Share | $ / shares         $ 12.07                            
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares         $ 15.62                            
Proceeds from Issuance of Common Stock | $         $ 9,250,000                            
Private Placement [Member] | Securities Purchase Agreement [Member]                                      
Stock Issued During Period, Shares, New Issues     1,174,440                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     2,283,740                                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 4.25                                
Private Placement [Member] | Maximum [Member]                                      
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right         621,376                            
Private Placement [Member] | Minimum [Member]                                      
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares         $ 4.25                            
IPO and Private Placement [Member]                                      
Stock Issued During Period, Shares, New Issues                                 3,282,940    
Proceeds from Issuance of Common Stock | $                                 $ 16,400,000