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 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     60,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 3,827,538   $ 3,827,538    
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     60,000   295,286
Allocated Share-based Compensation Expense, Total 69,640 $ 84,845 $ 208,813 $ 135,883  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 763,121   $ 763,121    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 244 days    
Restricted Stock [Member]          
Allocated Share-based Compensation Expense, Total 69,347 $ 47,211 $ 137,816 $ 91,238  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 244,996   $ 244,996    
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     $ 6.85