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Note 10 - Stockholders’ Equity (Details) - Share-based Compensation, Stock Options, Activity - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Share-based Compensation, Stock Options, Activity [Abstract]    
Number of Shares, Outstanding 1,057,500 1,072,000
Average Exercise Price per Share, Outstanding $ 1.37 $ 1.37
Aggregate Intrinsic Value, Outstanding [1] $ 834,750 $ 1,309,425
Weighted Average Remaining Contractual Term in Years, Outstanding 4 years 160 days 4 years 244 days
Number of Shares, Exercisable 982,500 532,500
Average Exercise Price per Share, Exercisable $ 1.35 $ 1.37
Aggregate Intrinsic Value, Exercisable [1] $ 796,500 $ 649,725
Weighted Average Remaining Contractual Term in Years, Exercisable 4 years 156 days 4 years 244 days
Number of Shares, Exercised (15,000)  
Average Exercise Price per Share, Exercised $ 1.26  
Number of Shares, Forfeited 0  
Average Exercise Price per Share, Forfeited $ 0  
[1] The intrinsic value of the stock options at March 31, 2018 is the amount by which the market value of the Company's common stock of $2.16 as of March 31, 2018 exceeds the exercise price of the option.