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Note 6 - Common Stock (Details Textual)
4 Months Ended 9 Months Ended
Jan. 09, 2018
USD ($)
$ / shares
shares
Aug. 31, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
$ / shares
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 4.45   $ 4.42
Stock Issued During Period, Value, New Issues     $ 11,000,000    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares     7,556,323    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares     994,695    
Proceeds from Stock Options Exercised     $ 99,000  
Certain Non-Employees [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares   994,695      
Proceeds from Stock Options Exercised   $ 99,470      
Follow-on Offering [Member]          
Stock Issued During Period, Shares, New Issues | shares 3,666,667        
Stock Issued During Period, Value, New Issues $ 11,000,000        
Stock Issuance Costs Incurred 1,200,000        
Proceeds from Issuance or Sale of Equity, Net of Issuance Costs $ 9,800,000        
Warrants Issued to Purchasers of Common Stock [Member] | Follow-on Offering [Member]          
Class of Warrant or Right, Issued During Period per Common Share Issued | shares 1.5        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 4.50        
Warrants Issued to Underwriters [Member] | Follow-on Offering [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 256,667        
Warrants and Rights Outstanding $ 598,737        
Warrants Issued to Underwriters [Member] | Follow-on Offering [Member] | Measurement Input, Expected Term [Member]          
Warrants and Rights Outstanding, Measurement Input 5        
Warrants Issued to Underwriters [Member] | Follow-on Offering [Member] | Measurement Input, Exercise Price [Member]          
Warrants and Rights Outstanding, Measurement Input 3.75        
Warrants Issued to Underwriters [Member] | Follow-on Offering [Member] | Measurement Input, Price Volatility [Member]          
Warrants and Rights Outstanding, Measurement Input 0.922        
Warrants Issued to Underwriters [Member] | Follow-on Offering [Member] | Measurement Input, Risk Free Interest Rate [Member]          
Warrants and Rights Outstanding, Measurement Input 0.0213