Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Equity (Details Textual)

v3.8.0.1
Note 9 - Equity (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 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 $ 2,885,475    
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 $ 139,172 $ 51,038  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 867,997    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 328 days    
Restricted Stock [Member]      
Allocated Share-based Compensation Expense, Total $ 68,469 $ 44,027  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 74,772    
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