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STOCKHOLDERS' EQUITY- Common stock issued in option exercise (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Options exercised 143,000 193,000 165,400
Exercise price $ 3.29 $ 2.96 $ 2.63
Shares issued 103,113 153,113 133,308
Shares retained 39,887 39,887 32,092
Cash paid at exercise   $ 100,000 $ 0
Stock price on date of exercise $ 11.80 $ 10.58 $ 13.18
Aggregate value of shares retained $ 470,750 $ 470,750 $ 435,785
Exercised Option 1      
Options exercised 25,000 110,000 4,100
Exercise price $ 7.50 $ 2.00 $ 2.00
Shares issued 9,829 90,375 3,491
Shares retained 15,171 19,625 609
Cash paid at exercise   $ 0 $ 0
Stock price on date of exercise $ 12.36 $ 11.21 $ 13.47
Aggregate value of shares retained $ 187,500 $ 220,000 $ 8,200
Exercised Option 2      
Options exercised 3,000 50,000 60,000
Exercise price $ 8.00 $ 2.00 $ 2.00
Shares issued 1,059 50,000 50,156
Shares retained 1,941 0 9,844
Cash paid at exercise   $ 100,000 $ 0
Stock price on date of exercise $ 12.36 $ 8.00 $ 12.19
Aggregate value of shares retained $ 24,000 $ 0 $ 120,000
Exercised Option 3      
Options exercised 3,000 25,000 200
Exercise price $ 5.25 $ 7.50 $ 8.00
Shares issued 1,750 9,829 116
Shares retained 1,250 15,171 84
Cash paid at exercise   $ 0 $ 0
Stock price on date of exercise $ 12.36 $ 12.36 $ 13.75
Aggregate value of shares retained $ 15,750 $ 187,500 $ 1,600
Exercised Option 4      
Options exercised 2,000 3,000 1,500
Exercise price $ 11.75 $ 8.00 $ 10.89
Shares issued 100 1,059 1,188
Shares retained 1,900 1,941 312
Cash paid at exercise   $ 0 $ 0
Stock price on date of exercise $ 12.36 $ 12.36 $ 13.75
Aggregate value of shares retained $ 23,500 $ 24,000 $ 16,335
Exercised Option 5      
Options exercised 110,000 3,000 600
Exercise price $ 2.00 $ 5.25 $ 5.25
Shares issued 90,375 1,750 229
Shares retained 19,625 1,250 371
Cash paid at exercise   $ 0 $ 0
Stock price on date of exercise $ 11.21 $ 12.36 $ 13.75
Aggregate value of shares retained $ 220,000 $ 15,750 $ 3,150
Exercised Option 6      
Options exercised   2,000 20,000
Exercise price   $ 11.75 $ 5.50
Shares issued   100 11,953
Shares retained   1,900 8,047
Cash paid at exercise   $ 0 $ 0
Stock price on date of exercise   $ 12.36 $ 13.67
Aggregate value of shares retained   $ 23,500 $ 110,000
Exercised Option 7      
Options exercised     2,000
Exercise price     $ 8.00
Shares issued     830
Shares retained     1,170
Cash paid at exercise     $ 0
Stock price on date of exercise     $ 13.67
Aggregate value of shares retained     $ 16,000
Exercised Option 8      
Options exercised     2,000
Exercise price     $ 5.25
Shares issued     1,232
Shares retained     768
Cash paid at exercise     $ 0
Stock price on date of exercise     $ 13.67
Aggregate value of shares retained     $ 10,500
Exercised Option 9      
Options exercised     15,000
Exercise price     $ 2.00
Shares issued     12,875
Shares retained     2,125
Cash paid at exercise     $ 0
Stock price on date of exercise     $ 14.12
Aggregate value of shares retained     $ 30,000
Exercised Option 10      
Options exercised     60,000
Exercise price     $ 2.00
Shares issued     51,238
Shares retained     8,762
Cash paid at exercise     $ 0
Stock price on date of exercise     $ 13.70
Aggregate value of shares retained     $ 120,000