Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stockholders' Equity (Details Textual)

v3.19.2
Note 4 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2019
Feb. 28, 2019
Aug. 31, 2017
Dec. 31, 2016
May 31, 2016
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Jun. 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           700,000   700,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value               $ 6.61  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross               46,379 0
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount           $ 171,000   $ 171,000  
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                
Series A 4.5% Convertible Preferred Stock [Member] | Subsequent Event [Member]                  
Conversion of Stock, Shares Converted 334,809                
Stock Issued During Period, Shares, Conversion of Convertible Securities 65,077                
Series A 4.5% Convertible Preferred Stock [Member] | Private Placement [Member]                  
Stock Issued During Period, Shares, New Issues       534,809          
Preferred Stock, Dividend Rate, Percentage       4.50%          
Convertible Preferred Stock, Issuable Upon Conversion of All Shares       103,950          
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   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              
Restricted Stock Units (RSUs) [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted               0 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period               0  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance           562   562  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value           $ 235.43   $ 235.43  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding           $ 3,300   $ 3,300  
Stock Issued During Period, Shares, RSU and Option Exercises, Net of Forfeitures               1,126  
Stock Issued During Period, Value, RSU and Option Exercises, Net of Forfeitures               $ 10,360  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised                 0
Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted               0 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value               $ 22.20  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested               $ 8,300  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance           0   0