Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Equity (Details Textual)

v3.10.0.1
Note 10 - Equity (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     110,792    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 3,815,537   $ 3,815,537    
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     110,792   295,286
Allocated Share-based Compensation Expense, Total 62,951 $ 125,588 $ 271,764 $ 261,471  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 792,031   $ 792,031    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 281 days    
Restricted Stock [Member]          
Allocated Share-based Compensation Expense, Total 59,825 $ 59,804 $ 197,641 $ 151,041  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 21 days    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 316,807   $ 316,807    
Minimum [Member]          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Exercise Price     $ 4.92    
Maximum [Member]          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Exercise Price     $ 8.25