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Note 5 - Equity (Details Textual)
3 Months Ended 12 Months Ended
Feb. 21, 2020
USD ($)
$ / shares
shares
Feb. 19, 2020
USD ($)
Jan. 23, 2020
USD ($)
$ / shares
shares
Jan. 21, 2020
USD ($)
$ / shares
shares
Jan. 01, 2020
shares
Nov. 22, 2019
USD ($)
$ / shares
shares
Jan. 01, 2019
shares
Apr. 03, 2018
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Mar. 31, 2018
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Jan. 29, 2018
USD ($)
$ / shares
shares
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                 $ 1.45     $ 1.45 $ 2.36  
Proceeds from Issuance of Common Stock | $                 $ 25,731,640        
Stock Issued During Period, Shares, Issued for Services (in shares)                 5,000     506,707    
Stock Issued During Period, Value, Issued for Services | $                 $ 1,550 $ 122   $ 469,588    
Preferred Stock, Shares Authorized (in shares)               10,000,000     10,000,000 10,000,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares                 $ 0.001   $ 0.001 $ 0.001    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)                 0     0    
Non-voting To Voting Common Stock, Conversion Ratio               1            
Common Stock, Shares Authorized (in shares)               200,000,000 200,000,000   200,000,000 200,000,000    
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares               $ 0.001 $ 0.001   $ 0.001 $ 0.001    
Common Stock, Shares, Outstanding, Ending Balance (in shares)                 32,849,841     19,263,841    
Class of Warrant or Right, Issued in Period (in shares)                 0     3,611,504    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)                 7,148,248     5,982,923 4,535,681  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)                 10 years          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares                 $ 2.55     $ 2.66 $ 3.31  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)                 1,165,325     1,744,300    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares                 $ 2     $ 1.48    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total (in shares)                       297,058    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)                 7 years 233 days     7 years 164 days    
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $                       $ 5,300,000    
Share-based Payment Arrangement, Expense | $                 $ 750,000          
Graded Vesting Method [Member]                            
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $                       5,200,000    
Cliff Vesting Method [Member]                            
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $                       $ 100,000    
Share-based Payment Arrangement, Option [Member]                            
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                       3 years    
Performance Shares [Member]                            
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                       1 year 36 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 (in shares)               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 (in shares)         963,192   761,957              
The 2009 Plan [Member]                            
Common Stock, Capital Shares Reserved for Future Issuance (in shares)               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%            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)               208,500            
Minimum [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares                 $ 0.001          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares                 0.001          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares                 1.28     $ 0.30    
Maximum [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares                 9.80          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares                 7.93          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares                 $ 2.67     $ 1.62    
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 (Year)                       2 years 76 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 (Year)                       91 days    
Conversion of Preferred Stock to Common Stock [Member]                            
Conversion of Stock, Shares Converted (in shares)                     1,394,953      
Conversion of Stock, Shares Issued (in shares)               1,235,219     9,324,177      
Warrants Issued with Registered Direct Offering [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)           3,167,986                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares           $ 0.46                
Warrants Issued to Underwriter [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)           443,518           3,167,986    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares           $ 0.50           $ 0.46    
Warrants, Exercise Price, Percentage of RDO Price Per Share (in dollars per share) | $ / shares           $ 125                
Warrants Issued for Services [Member] | FundAthena, Inc [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                           6,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                           $ 5
Class of Warrant or Right, Issued in Period (in shares)                         0  
Accounts Payable, Total | $                           $ 30,000
Registered Direct Offering [Member]                            
Stock Issued During Period, Shares, New Issues (in shares)           3,167,986     13,581,000     3,167,986    
Shares Issued, Price Per Share (in dollars per share) | $ / shares           $ 0.40                
Proceeds from Issuance of Common Stock | $           $ 1,093,000     $ 25,731,640     $ 1,267,194    
Registered Direct Offerings, Maximum Offering Size, Increase | $   $ 3,000,000                        
Registered Direct Offering [Member] | Underwriter [Member]                            
Stock Issued During Period, Shares, New Issues (in shares)                       443,518    
Shares Issued, Price Per Share (in dollars per share) | $ / shares                       $ 0.50    
Percentage of Common Stock Issuance of Warrant or Right Issued           7.00%                
Registered Direct Offering [Member] | Accredited Investor [Member]                            
Stock Issued During Period, Shares, New Issues (in shares)       961,000                    
Shares Issued, Price Per Share (in dollars per share) | $ / shares       $ 0.24                    
Proceeds from Issuance of Common Stock | $       $ 200,000                    
Registered Direct Offering [Member] | Investors [Member]                            
Stock Issued During Period, Shares, New Issues (in shares) 5,000,000   7,620,000                      
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 3.50   $ 1.05                      
Proceeds from Issuance of Common Stock | $ $ 16,000,000   $ 7,200,000                      
Private Placement [Member]                            
Stock Issued During Period, Shares, New Issues (in shares)                       350,000    
Private Placement [Member] | Securities Purchase Agreement [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                       2,283,740    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                       $ 0.46    
Private Placement [Member] | Securities Purchase Agreement [Member] | Minimum [Member]                            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                       4.25    
Private Placement [Member] | Securities Purchase Agreement [Member] | Maximum [Member]                            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                       $ 0.46