Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Subsequent Events (Details Textual)

v3.19.2
Note 7 - Subsequent Events (Details Textual) - USD ($)
6 Months Ended
Jul. 10, 2019
Jun. 19, 2019
Jun. 16, 2019
Jun. 30, 2019
Feb. 19, 2019
Dec. 31, 2018
Shares Issued, Price Per Share         $ 5  
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 6.63   $ 1.75
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       589,550    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance       $ 2.49   $ 1.74
Share-based Payment Arrangement, Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years    
Subsequent Event [Member] | Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 19,000          
Subsequent Event [Member] | Employees [Member] | Share-based Payment Arrangement, Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance $ 17.50          
Warrants Issued in Private Investment in Public Equity Offering [Member]            
Proceeds from Issuance or Sale of Equity, Total     $ 8,600,000      
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right     1      
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 16 $ 16      
Private Investment in Public Equity Offering [Member]            
Number of Units Issued   675,000 675,000      
Shares Issued, Price Per Share   $ 14 $ 14      
Proceeds from Issuance or Sale of Equity, Total   $ 9,450,000        
Number of Common Stock Per Unit   1 1      
Number of Warrants Per Unit   0.7 0.7      
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right   1