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Note 10 - Stockholders’ Equity (Details) - Share-based Compensation, Stock Options, Activity - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Share-based Compensation, Stock Options, Activity [Abstract]    
Number of Shares, Outstanding   1,367,500
Average Exercise Price per Share, Outstanding   $ 1.34
Weighted Average Remaining Contractual Term in Years, Outstanding 3 years 3 months 3 years 350 days
Number of Shares, Exercisable   1,125,000
Average Exercise Price per Share, Exercisable   $ 1.37
Weighted Average Remaining Contractual Term in Years, Exercisable 3 years 83 days 3 years 9 months
Number of Shares, Granted 35,000  
Average Exercise Price per Share, Granted $ 0.77  
Weighted Average Remaining Contractual Term in Years, Granted 4 years 321 days  
Number of Shares, Forfeited 0  
Average Exercise Price per Share, Forfeited $ 0  
Number of Shares, Outstanding 1,402,500  
Average Exercise Price per Share, Outstanding $ 1.33  
Aggregate Intrinsic Value, Outstanding [1] $ 0  
Number of Shares, Exercisable 1,385,000  
Average Exercise Price per Share, Exercisable $ 1.34  
Aggregate Intrinsic Value, Exercisable [1] $ 0  
[1] The intrinsic value of the stock options at September 30, 2019 is the amount by which the market value of the Company's common stock of $0.64 as of September 30, 2019 exceeds the exercise price of the option.