Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Shareholders' Equity (Details Textual)

v3.19.1
Note 10 - Shareholders' Equity (Details Textual) - USD ($)
 3 Months Ended
Mar. 29, 2018
Mar. 31, 2019
Dec. 31, 2018
Common Stock, No Par Value   $ 0 $ 0
Private Placement [Member]      
Units Issued During Period, Units, New Issues 1,322,965    
Shares Issued, Price Per Share $ 4.90    
Proceeds From Issuance of Units $ 6,300,000    
Units, Number of Common Shares Per Unit 1    
Units, Number of Common Share Purchase Warrant Per Unit 0.5    
Payment for Finders Fee $ 384,000    
Warrants Issued in Private Placement [Member]      
Stock Issued During Period, Shares, Exercise of Common Stock Warrants   0  
Class of Warrant or Right, Issued During Period 661,482    
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 $ 7    
Warrants and Rights Outstanding, Expiration, Stock Price Trigger $ 12    
Compensation Warrants [Member]      
Class of Warrant or Right, Issued During Period 80,510    
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 $ 4.90    
Warrants and Rights Outstanding, Term 2 years