Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stockholders' Equity (Details Textual)

v3.10.0.1
Note 4 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Aug. 31, 2017
Dec. 31, 2016
May 31, 2016
Sep. 30, 2018
Sep. 30, 2017
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       6,100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 0.77 $ 3.19
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options       $ 363,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 109 days  
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   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  
Restricted Stock Units (RSUs) [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       273 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       45,046  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 1.11 5.37
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       25,000  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance       56,281  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value       $ 3.24  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding       $ 60,000  
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       $ 37,000  
Restricted Stock [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       273 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       45,046  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 1.11 $ 3.63
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options       $ 38,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value       $ 2.65  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested       $ 81,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance       33,785  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance       $ 1.11