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EMPLOYEE STOCK OPTION PLAN (Tables)
 12 Months Ended
Dec. 31, 2017
EMPLOYEE STOCK OPTION PLAN [Abstract]  
Assumptions made in calculating the fair values of options
The weighted-average assumptions made in calculating the fair values of options are as follows for the respective years ended:

 
December 31, 2017
  
December 31, 2016
  
December 31, 2015
 
Expected term (in years)
  
5.48
   
4.71
   
n/a
 
Expected volatility
  
43.31
%
  
45.78
%
  
n/a
 
Expected dividend yield
  
n/a
   
n/a
   
n/a
 
Risk-free interest rate
  
1.78
%
  
0.92
%
  
n/a
 
Stock options activity
The following table provides stock options activity for the years ended December 31, 2017, 2016, and 2015:

  
Number of
Shares
  
Weighted
Average
Exercise Price per
Share
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate Intrinsic
Value
 
Outstanding at December 31, 2014
  
691,869
   
3.66
 
3.97 years
 
$
334,636
 
              
Granted
  
-
   
-
      
Exercised
  
41,141
   
2.25
    
65,449
 
Forfeited/expired/cancelled
  
1,250
   
4.30
      
Outstanding at December 31, 2015
  
649,478
   
3.75
 
3.21 years
 
$
1,032,362
 
              
Exercisable at December 31, 2015
  
359,228
   
3.89
 
2.03 years
 
$
522,039
 
              
Outstanding at December 31, 2015
  
649,478
   
3.75
 
3.21 years
 
$
1,032,362
 
              
Granted
  
142,875
   
7.08
      
Exercised
  
191,804
   
3.73
    
629,143
 
Forfeited/expired/cancelled
  
-
   
-
      
Outstanding at December 31, 2016
  
600,549
   
4.55
 
3.43 years
 
$
1,463,052
 
              
Exercisable at December 31, 2016
  
267,549
   
4.14
 
2.66 years
 
$
731,997
 
              
Outstanding at December 31, 2016
  
600,549
  
$
4.55
 
3.43 years
 
$
1,463,052
 
 
        
 
    
Granted
  
267,875
  
$
6.40
 
 
    
Exercised
  
56,969
  
$
4.19
 
 
  
100,018
 
Forfeited/expired/cancelled
  
785
  
$
5.56
 
 
    
Outstanding at December 31, 2017
  
810,670
  
$
5.18
 
3.69 years
 
$
2,477,853
 
 
        
 
    
Exercisable at December 31, 2017
  
371,295
  
$
4.44
 
2.62 years
 
$
1,409,440
 
Summary of stock options outstanding
The following table summarizes information about stock options outstanding at December 31, 2017:

 
 
Stock Options Outstanding
  
Stock Options Exercisable
 
Range of
Exercise
Prices
 
Shares
  
Average
Remaining
Contract Life
(Year)
  
Weighted
Average
Exercise
Price
  
Aggregate
Intrinsic
Value
  
Shares
  
Weighted
Average
Exercise
Price
  
Aggregate
Intrinsic
Value
 
1 to 2.79999
  
-
   
-
  
$
-
  
$
-
   
-
  
$
-
  
$
-
 
2.8 to 4.59999
  
362,750
   
2.68
   
3.51
   
1,702,125
   
244,000
   
3.55
   
1,135,255
 
4.6 to 6.39999
  
240,045
   
3.56
   
5.73
   
592,678
   
96,545
   
5.49
   
261,585
 
6.4 to 8.19999
  
161,000
   
6.26
   
7.06
   
183,050
   
12,000
   
7.15
   
12,600
 
8.2 to 10
  
46,875
   
3.44
   
8.86
   
-
   
18,750
   
8.86
   
-
 
 Total
  
810,670
   
3.69
  
$
5.18
  
$
2,477,853
   
371,295
  
$
4.44
  
$
1,409,440