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Note 10 - Stockholders’ Equity (Details) - Share-based Compensation, Stock Options, Activity - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 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 259 days 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 219 days 3 years 9 months
Number of Shares, Forfeited 0  
Average Exercise Price per Share, Forfeited $ 0  
Number of Shares, Outstanding 1,367,500  
Average Exercise Price per Share, Outstanding $ 1.34  
Aggregate Intrinsic Value, Outstanding [1] $ 0  
Number of Shares, Exercisable 1,217,500  
Average Exercise Price per Share, Exercisable $ 1.36  
Aggregate Intrinsic Value, Exercisable [1] $ 0  
[1] The intrinsic value of the stock options at March 29, 2019 is the amount by which the market value of the Company's common stock of $0.88 as of March 29, 2019 exceeds the exercise price of the option.