General form of registration statement for all companies including face-amount certificate companies

Note 4 - Stockholders' Equity (Details Textual)

v3.19.2
Note 4 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
May 01, 2016
Apr. 30, 2019
Oct. 31, 2018
Aug. 31, 2017
Dec. 31, 2016
May 31, 2016
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             10 years   10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant             500,000   500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value               $ 6.80 $ 9.40 $ 26.80  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             40,000 0 24,432    
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount             $ 250,000   $ 179,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition             292 days   1 year 328 days    
Additional Research and Development Expense Due to Modifications             $ 102,000        
Private Placement [Member]                      
Class of Warrant or Right, Issued During Period     150,000                
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 15                
Warrants and Rights Outstanding, Term     5 years 182 days                
Stock Issued During Period, Shares, New Issues     150,000                
Series A 4.5% Convertible Preferred Stock [Member] | Subsequent Event [Member]                      
Conversion of Stock, Shares Converted   465,191                  
Stock Issued During Period, Shares, Conversion of Convertible Securities   90,419                  
Series A 4.5% Convertible Preferred Stock [Member] | Private Placement [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         194,369            
Stock Purchase Warrants [Member]                      
Class of Warrant or Right, Issued During Period 87,309     112,500   87,309 25,000        
Class of Warrant or Right, Outstanding       149,135         149,135    
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 11.40       $ 6       $ 40
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 Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                 182 days    
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             1,688        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value             $ 93.20        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding             $ 15,200   $ 17,000    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised             0   0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested                   $ 23,000  
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount                 $ 25,000    
Restricted Stock [Member]                      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition             91 days   182 days    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted             0        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period                 3,624    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding                 $ 7,000    
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   $ 48.20    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested             $ 5,100   $ 84,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance             563        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance             $ 22.20        
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount             $ 12,500   $ 25,000