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EMPLOYEE STOCK PLANS - Unvested Options (Details) - Employee stock option
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Number of Options  
Unvested options outstanding, beginning of year (in shares) | shares 248,382
Granted (in shares) | shares 5,000
Vested (in shares) | shares (72,685)
Forfeited (in shares) | shares (4,000)
Unvested options outstanding, end of year (in shares) | shares 176,697
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Unvested options outstanding, beginning of year (in dollars per share) | $ / shares $ 4.93
Granted (in dollars per share) | $ / shares 3.17
Vested (in dollars per share) | $ / shares 4.87
Forfeited (in dollars per share) | $ / shares 5.59
Unvested options outstanding, end of year (in dollars per share) | $ / shares $ 4.89