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Note 9 - Subsequent Events (Details Textual)
3 Months Ended 12 Months Ended
Apr. 27, 2020
USD ($)
shares
Apr. 24, 2020
$ / shares
shares
Apr. 01, 2020
shares
Mar. 31, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
May 04, 2020
Stock Issued During Period, Shares, Issued for Services (in shares)       5,000 506,707  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       1,165,325 1,744,300  
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) | $ / shares       $ 0.46  
Subsequent Event [Member]            
Stock Issued During Period, Shares, Issued for Services (in shares)     5,000      
Subsequent Event [Member] | License Agreement [Member] | MD Anderson [Member]            
Number of Allowed Patents           16
Subsequent Event [Member] | Dr. Julian Pham [Member]            
Months of Pay Eligible to be Received (Month) 150 days          
Base Salary | $ $ 375,000          
Aggregate Amount of Base Salary Eligible to be Received | $ $ 156,250          
Months of Insurance Coverage Eligible for Reimbursement (Month) 150 days          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 410,117          
Subsequent Event [Member] | Warrants Issued for Services [Member]            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   500,000        
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) | $ / shares   $ 2.27        
Subsequent Event [Member] | New Employee [member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   50,000