Annual report pursuant to Section 13 and 15(d)

EMPLOYEE STOCK OPTIONS AND RESTRICTED STOCK AWARD PLAN (Details Textual)

v3.10.0.1
EMPLOYEE STOCK OPTIONS AND RESTRICTED STOCK AWARD PLAN (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 677,120    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 1,650,573    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 10 months 24 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 1,993,800    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 1,993,800    
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased $ 5.08    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 1,470,230 $ 1,744,047 $ 65,089
Share-based Compensation $ 3,870,934 $ 3,685,079 $ 2,267,053
number of options granted 846,000    
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 193,000 165,400 25,900
Share-based Compensation $ 1,853,913 $ 3,618,309 $ 2,267,053
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 5,182,221    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year    
Share-based Compensation $ 2,017,021 $ 66,770  
number of restricted stock vested 64,620 0  
aggregate intrinsic value of vested restricted stock $ 304,360