Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stockholders' Equity (Details Textual)

v3.19.3
Note 4 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2019
Feb. 28, 2019
Aug. 31, 2017
Dec. 31, 2016
May 31, 2016
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period               10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant               8,500,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value               $ 3.45 $ 15.40
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount               $ 384,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition               255 days  
Additional Research and Development Expense Due to Modifications             $ 102,000    
Stock Issued During Period, Value, RSU and Option Exercises, Net of Forfeitures                
Proceeds from Warrant Exercises               $ 131
Proceeds from Issuance or Sale of Equity, Net of Issuance Costs               $ 6,552,842
Series A 4.5% Convertible Preferred Stock [Member]                  
Conversion of Stock, Shares Converted 334,809                
Stock Issued During Period, Shares, Conversion of Convertible Securities 65,077                
Underwritten Public Offering [Member]                  
Number of Prefunded Units Sold 2,361,462                
Number of Units Sold 416,315                
Unit Price $ 2.70                
Proceeds from Issuance or Sale of Equity, Total $ 7,500,000                
Number of Common Stock in Each Unit 1                
Number of Short-term Warrants in Each Unit 1                
Number of Long-term Warrants in Each Unit 1                
Number of Prefunded Warrants in Each Prefunded Unit 1                
Number of Short-term Warrants in Each Prefunded Unit 1                
Number of Long-term Warrants in Each Prefunded Unit 1                
Proceeds from Issuance or Sale of Equity, Net of Issuance Costs $ 6,600,000                
Private Placement [Member] | Series A 4.5% Convertible Preferred Stock [Member]                  
Stock Issued During Period, Shares, New Issues       200,000          
Preferred Stock, Dividend Rate, Percentage       4.50%          
Convertible Preferred Stock, Issuable Upon Conversion of All Shares       38,873          
Over-Allotment Option [Member]                  
Underwriters, Additional Common Shares Authorized to Purchase 416,666                
Underwriters, Additional Warrants Authorized to Purchase 416,666                
Stock Purchase Warrants [Member]                  
Class of Warrant or Right, Issued During Period   25,000 112,500   87,309        
Class of Warrant or Right, Outstanding               149,136  
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 6              
Class of Warrant or Right, Granted During Period, Weighted Average Grant Date Fair Value   $ 3.80              
Class of Warrant or Right, Vesting Percentage on Grant   25.00%              
Class of Warrant or Right, Vesting Percentage on Completion of Initial Services   75.00%              
Warrants and Rights Outstanding, Term   2 years 182 days              
Stock Purchase Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]                  
Warrants and Rights Outstanding, Measurement Input   0              
Stock Purchase Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]                  
Warrants and Rights Outstanding, Measurement Input   0.025              
Stock Purchase Warrants [Member] | Measurement Input, Price Volatility [Member]                  
Warrants and Rights Outstanding, Measurement Input   1.1              
Short-term Warrants [Member] | Underwritten Public Offering [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 2.70                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 3,194,443                
Long-term warrants [Member] | Underwritten Public Offering [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 2.70                
Warrants and Rights Outstanding, Term 5 years                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 3,194,443                
Prefunded Warrants [Member]                  
Class of Warrant or Right, Exercised During Period               1,313,296  
Proceeds from Warrant Exercises               $ 100  
Prefunded Warrants [Member] | Underwritten Public Offering [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.0001                
Equity Classified Warrants [Member] | Underwritten Public Offering [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 3.375                
Warrants and Rights Outstanding, Term 5 years                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 222,223                
Restricted Stock Units (RSUs) [Member]                  
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount               $ 22,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition               292 days  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted               4,904 2,253
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value               $ 5.90 $ 22.20
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value               $ 6,400  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance               5,467  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value               $ 29.62  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding               $ 10,400  
Stock Issued During Period, Shares, RSU and Option Exercises, Net of Forfeitures               1,127  
Stock Issued During Period, Value, RSU and Option Exercises, Net of Forfeitures               $ 10,400  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised               0  
Restricted Stock [Member]                  
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount               $ 71,300  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition               292 days  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted               15,689 2,253
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value               $ 5.95 $ 22.20
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value               $ 9.73  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding               $ 14,500  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance               11,972  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance               $ 5.95