Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Stockholders' Equity (Details Textual)

v3.19.1
Note 8 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Feb. 28, 2019
May 31, 2014
Mar. 31, 2019
Mar. 31, 2018
Feb. 06, 2019
Dec. 31, 2018
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 1.45 $ 1.45     $ 1.45     $ 2.55
Proceeds from Issuance of Private Placement     $ 250,000 $ 10,000,000 $ 250,000    
Proceeds from Issuance of Common Stock         $ 1,974,546    
Equity Securities Issued             1,840,000  
Common Stock, Shares, To be Issued 90,000 90,000     90,000      
Share Price $ 0.33 $ 0.33     $ 0.33      
Chief Executive Officer, Chief Financial Officer and Employees [Member]                
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance 2,127,843 2,127,843     2,127,843     1,908,813
Non-Employees [Member]                
Common Stock, Capital Shares Reserved for Future Issuance 679,867 679,867     679,867     561,752
Preferred Stock Converted to Common Stock [Member]                
Conversion of Stock, Conversion Price $ 1.17              
Conversion of Stock, Shares Issued 5,982,906              
Warrants, Public Offering [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     1,428,750          
Warrants and Rights Outstanding, Term     5 years          
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.50          
Underwrite Warrants [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 141,850 141,850 141,850   141,850      
Warrants, Private Offering [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     178,571          
Warrants and Rights Outstanding, Term     5 years          
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.50          
Public Offering [Member]                
Proceeds from Issuance or Sale of Equity, Total     $ 2,000,000          
Stock Issued During Period, Shares, New Issues     5,715,000          
Proceeds from Stock Options Exercised   $ 198,000 $ 198,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   567,400 567,400          
Private Placement [Member]                
Stock Issued During Period, Shares, New Issues     714,286 2,000,000        
Proceeds from Issuance of Common Stock       $ 3,000,000        
Shares Issued, Price Per Share       $ 1.50        
Proceeds from Issuance of Convertible Preferred Stock       $ 7,000,000        
Private Placement [Member] | Series A Convertible Preferred Stock [Member]                
Stock Issued During Period, Shares, New Issues       7,000        
Shares Issued, Price Per Share       $ 1,000        
Preferred Stock, Redemption Price Per Share       2.545        
Private Placement [Member] | Series A Convertible Preferred Stock [Member] | Conversion Price if Common Stock Not Trade at 3.15 [Member]                
Preferred Stock, Redemption Price Per Share       1.50        
Convertible Preferred Stock, Shares Price Trigger       $ 3.15