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STOCK OPTIONS - Plan Information and FV Assumptions (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Stock options    
Number of shares of common stock authorized for issuance 442,750  
Compensation cost recognized $ 25,007 $ 21,743
Unrecognized compensation cost $ 33,000  
Period during which compensation cost is expected to be recognized 3 years  
Proceeds from the exercise of stock $ 3,765  
Minimum    
Stock options    
Price range of stock award (as a percent) 85.00%  
Maximum    
Stock options    
Price range of stock award (as a percent) 110.00%  
Stock Options.    
Stock options    
Period over which options become exercisable 3 years  
Common stock reserved for future grants (in shares) 104,239  
Proceeds from the exercise of stock $ 3,800 $ 0
Estimated forfeiture rate (as a percent) 3.00%  
Assumptions used to determine fair value of stock options granted    
Dividend yield (as a percent) 0.00% 0.00%
Expected volatility (as a percent) 42.40%  
Expected life of option 5 years 5 years
Risk-free interest rate (as a percent) 1.30%  
Fair value of each option on grant date (in dollars per share) $ 4.02 $ 5.92
Stock Options. | Minimum    
Assumptions used to determine fair value of stock options granted    
Expected volatility (as a percent)   42.30%
Risk-free interest rate (as a percent)   1.40%
Fair value of each option on grant date (in dollars per share)   $ 5.43
Stock Options. | Maximum    
Stock options    
Expiration period of options granted 7 years  
Assumptions used to determine fair value of stock options granted    
Expected volatility (as a percent)   42.40%
Risk-free interest rate (as a percent)   1.50%
Fair value of each option on grant date (in dollars per share)   $ 6.14