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Note 9 - Options and Warrants to Purchase Common Stock (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 14, 2017
USD ($)
$ / shares
$ / item
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Feb. 01, 2018
USD ($)
Dec. 07, 2016
shares
May 31, 2016
shares
Nov. 20, 2012
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares     4,224,999 35,810,289 3,771,488        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares     $ 0.11 $ 0.06 $ 0.24        
Price Per Unit | $ / item 0.04                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value   $ 4,114,914 $ 4,114,914 $ 0          
Warrants In Connection with Units [Member]                  
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares 0.25                
Performance-based Options [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 27,500,000                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares $ 0.06                
Performance-based Options [Member] | Share-based Compensation Award, Tranche One [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%                
Performance-based Options, Vesting Feature, Close Sale of Units, Amount $ 600,000                
Performance-based Options [Member] | Share-based Compensation Award, Tranche Two [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 25.00%                
Performance-based Options, Vesting Feature, Close Sale of Units, Amount $ 900,000                
Performance-based Options, Vesting Feature, Additional Cash Proceeds $ 900,000         $ 900,000      
Performance-based Options [Member] | Share-based Compensation Award, Tranche Three [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 8.30%                
Performance-based Options, Vesting Feature, EBITDA, Positive Period 1 year                
Performance-based Options [Member] | Share-based Compensation Award, Tranche Four [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 8.30%                
Performance-based Options, Vesting Feature, EBITDA, Minimum Value Over 12 Month Period $ 2,000,000                
Performance-based Options [Member] | Share-based Compensation Award, Tranche Five [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 8.40%                
Performance-based Options, Vesting Feature, EBITDA, Minimum Value Over 12 Month Period $ 4,000,000                
Employee Stock Option [Member]                  
Allocated Share-based Compensation Expense, Total   192,299 775,299 961,221 $ 698,350        
Time-based Unvested Options [Member]                  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   442,520 $ 442,520 $ 303,522          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     193 days 146 days          
Performance-based Unvested Options [Member]                  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   $ 354,750 $ 354,750 $ 709,500          
LTIP [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares                 8,900,000
2016 LTIP [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares               2,000,000  
Incentive Plan 2016 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares             15,000,000    
2017 IP [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares 40,000,000