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STOCKHOLDERS' EQUITY (Tables)
12 Months Ended
Dec. 31, 2017
Stockholders Equity Tables  
Summary of restricted stock unit activity
    Number of Shares     Weighted-Average Grant Date Fair Value  
Balance of restricted stock units outstanding at December 31, 2016     890,000     $ 2.29  
Grants of restricted stock units     40,500       3.80  
Vested restricted stock units     (110,500 )     2.96  
Balance of unvested restricted stock units at December 31, 2017     820,000     $ 2.28  
Schedule of stock option activity
    2017     2016  
          Weighted           Weighted  
          Average           Average  
    Options     Exercise     Options     Exercise  
    Outstanding     Price     Outstanding     Price  
                         

Options outstanding

at beginning of year

    2,310,000     $ 1.29       2,855,000     $ 1.33  

 

Granted

                       
Expired                 (15,000 )   $ 1.31  
Exercised     (300,000 )   $ 1.31       (530,000 )   $ 1.53  
                                 
Options outstanding at end of year     2,010,000     $ 1.28       2,310,000     $ 1.29  
                                 
Options exercisable at end of year     2,010,000     $ 1.28       2,310,000     $ 1.29  
Summary of information of stock options outstanding and exercisable

            Weighted    
        Weighted   Average    
Range of       Average   Remaining    
Exercise   Options   Exercise   Life in   Options
Price   Outstanding   Price   Years   Exercisable
                 
$0.83 - $2.34   2,010,000      $1.28   2.10   2,010,000
                 
                 

Outstanding warrants purchase shares
         
Number of Warrants   Exercise Price   Expiration Date
         
250,000   $2.10   May 21, 2018
125,000   $2.10   July 26, 2018
375,000