Annual report pursuant to Section 13 and 15(d)

Note 4 - Stockholders' Equity (Details Textual)

v3.19.1
Note 4 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 12, 2018
Oct. 31, 2018
Aug. 31, 2017
Dec. 31, 2016
May 31, 2016
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
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           10,800,000 10,800,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value             $ 0.47 $ 1.34  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value             $ 205,000 $ 302,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options           $ 179,000 $ 179,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition             1 year 328 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             488,640    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price             $ 1.13    
Private Placement [Member]                  
Class of Warrant or Right, Issued During Period   3,000,000              
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.75              
Stock Issued During Period, Shares, New Issues   3,000,000              
Shares Issued, Price Per Share   $ 0.70              
Proceeds from Issuance of Private Placement   $ 2,100,000              
Warrants and Rights Outstanding, Term   5 years 182 days              
Private Placement [Member] | Series A 4.5% Convertible Preferred Stock [Member]                  
Stock Issued During Period, Shares, New Issues       1,000,000          
Preferred Stock, Dividend Rate, Percentage       4.50%          
Convertible Preferred Stock, Issuable Upon Conversion of All Shares       3,887,387          
Stock Purchase Warrants [Member]                  
Class of Warrant or Right, Issued During Period     2,250,000   1,746,173        
Class of Warrant or Right, Outstanding           2,982,709 2,982,709    
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.57             $ 2
Stock Purchase Warrants Issued to Placement Agent [Member]                  
Class of Warrant or Right, Issued During Period   180,000       180,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.875       $ 0.875 $ 0.875    
Warrants and Rights Outstanding, Term           5 years 5 years    
Stock Purchase Warrants Issued to Investor [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.75              
Restricted Stock Units (RSUs) [Member]                  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition             182 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding           $ 17,000 $ 17,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value             $ 50,000 25,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested               $ 23,000  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised             0    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options           25,000 $ 25,000    
Restricted Stock [Member]                  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition             182 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding           7,000 $ 7,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested             84,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options           $ 25,000 $ 25,000    
Inducement Award Stock Option Plan [Member] | Chief Executive Officer [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 800,000                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 0.425                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares 200,000                
Inducement Award Stock Option Plan [Member] | Chief Executive Officer [Member] | Vest Over Two Year Period [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares 200,000                
Inducement Award Stock Option Plan [Member] | Chief Executive Officer [Member] | Vest Based on Achiement of Certain Milestones [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares 400,000                
Inducement Award Stock Option Plan [Member] | Chief Executive Officer [Member] | Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years