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Note 11 - Stockholders’ Equity (Details) - Share-based Compensation, Stock Options, Activity - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Share-based Compensation, Stock Options, Activity [Abstract]    
Number of Shares, Outstanding 1,072,500  
Average Exercise Price per Share, Outstanding $ 1.37  
Weighted Average Remaining Contractual Term in Years, Outstanding 4 years 244 days 3 years 350 days
Number of Shares, Exercisable 532,500  
Average Exercise Price per Share, Exercisable $ 1.37  
Weighted Average Remaining Contractual Term in Years, Exercisable 4 years 244 days 3 years 9 months
Number of Shares, Granted   335,000
Average Exercise Price per Share, Granted   $ 1.25
Weighted Average Remaining Contractual Term in Years, Granted   5 years
Number of Shares, Exercised   (40,000)
Average Exercise Price per Share, Exercised   $ 1.26
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   1,125,000
Average Exercise Price per Share, Exercisable   $ 1.37
Aggregate Intrinsic Value, Exercisable [1]   $ 0
[1] The intrinsic value of the stock options at December 31, 2018 is the amount by which the market value of the Company's common stock of $0.46 as of December 31, 2018 exceeds the exercise price of the option.