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EQUITY PLANS (Details) (USD $)
 12 Months Ended 1 Months Ended 67 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 91 Months Ended 67 Months Ended 12 Months Ended 91 Months Ended 1 Months Ended 67 Months Ended 12 Months Ended 67 Months Ended
Dec. 27, 2013
plan
Dec. 28, 2012
Dec. 30, 2011
Jun. 30, 2006
2006 Plan
Dec. 27, 2013
2006 Plan
Mar. 31, 2008
2008 Plan
Dec. 28, 2012
2008 Plan
Dec. 31, 2010
2008 Plan
Dec. 27, 2013
2008 Plan
Jun. 30, 2008
2008 Plan
Dec. 27, 2013
2006 Employee Stock Purchase Plan
Jun. 30, 2006
2006 Employee Stock Purchase Plan
Dec. 27, 2013
Stock options
Dec. 28, 2012
Stock options
Dec. 30, 2011
Stock options
Dec. 31, 2010
Stock options
Dec. 27, 2013
Stock options
Minimum
Dec. 28, 2012
Stock options
Minimum
Dec. 30, 2011
Stock options
Minimum
Dec. 27, 2013
Stock options
Maximum
Dec. 28, 2012
Stock options
Maximum
Dec. 30, 2011
Stock options
Maximum
Dec. 27, 2013
Stock options
2008 Plan
Dec. 27, 2013
Incentive stock options
2006 Plan
Dec. 27, 2013
Incentive stock options
2008 Plan
Dec. 27, 2013
Incentive stock options
2008 Plan
Maximum
Dec. 27, 2013
Non-statutory/Nonqualified stock options
2006 Plan
Mar. 31, 2008
Non-statutory/Nonqualified stock options
2006 Plan
Maximum
Dec. 27, 2013
Non-statutory/Nonqualified stock options
2008 Plan
Dec. 27, 2013
Non-statutory/Nonqualified stock options
2008 Plan
Maximum
Dec. 27, 2013
Restricted stock
Dec. 28, 2012
Restricted stock
Dec. 30, 2011
Restricted stock
Dec. 27, 2013
Restricted stock
2008 Plan
Dec. 27, 2013
Restricted stock
2008 Plan
EQUITY PLANS                                                                      
Number of share-based compensation plans 2                                                                    
Compensation expense recognized for stock options issued (in dollars) $ 150,000 $ 227,000 $ 201,000                                                                
Equity plans                                                                      
Termination period of the plan       10 years   10 years                                                          
Granted (in shares)         0               100,000 202,000 86,000                                        
Number of shares of common stock reserved for issuance       300,000                                                              
Number of shares of common stock reserved for issuance         193,500       1,406,500     300,000                                              
Shares available for grant under 2008 Plan from 2006 Plan                   70,333                                                  
Expiration period from date of grant                                                   10 years   10 years   10 years          
Options granted, net of forfeitures, expirations and exercises (in shares)                                               187,500 408,833   6,000   376,000            
Number of additional shares authorized             500,000 350,000                                                      
Maximum number of shares a participant may be granted in options to purchase during fiscal year                                             100,000                        
Shares granted                                                                     25,000
Assumptions                                                                      
Expected volatility (as a percent)                         40.00% 39.00%                                          
Expected volatility, minimum (as a percent)                             39.00%                                        
Expected volatility, maximum (as a percent)                             40.00%                                        
Expected dividends (as a percent)                         0.00% 0.00% 0.00%                                        
Expected term                                 5 years 9 months 5 years 9 months 5 years 9 months 6 years 6 years 6 years                          
Risk-free rate, minimum (as a percent)                         1.31% 0.65% 0.88%                                        
Risk-free rate, maximum (as a percent)                         1.36% 1.09% 2.20%                                        
Vesting period                                                                   2 years  
Fully-vested options                                                                      
Intrinsic value of the fully-vested options (in dollars)                         219,000                                            
Stock price at the end of the year (in dollars per share) $ 4.91                                                                    
Options                                                                      
Outstanding at the beginning of the period (in shares)                         992,000 912,000 859,000                                        
Granted (in shares)         0               100,000 202,000 86,000                                        
Exercised (in shares)                         (9,000) (5,000) (3,000)                                        
Forfeited or expired (in shares)                         (105,000) (117,000) (30,000)                                        
Outstanding at the end of the period (in shares)                         978,000 992,000 912,000 859,000                                      
Vested at the end of the period (in shares)                         796,000 700,000 570,000                                        
Exercisable at the end of the period (in shares)                         796,000 700,000 570,000                                        
Weighted-Average Exercise Price                                                                      
Outstanding at the beginning of the period (in dollars per share)                         $ 3.86 $ 3.94 $ 3.90                                        
Granted (in dollars per share)                         $ 3.62 $ 3.30 $ 4.02                                        
Exercised (in dollars per share)                         $ 1.65 $ 1.81 $ 1.96                                        
Outstanding at the end of the period (in dollars per share)                         $ 3.95 $ 3.86 $ 3.94 $ 3.90                                      
Vested at the end of the period (in dollars per share)                         $ 4.04 $ 4.09 $ 4.61                                        
Exercisable at the end of the period (in dollars per share)                         $ 4.04 $ 4.09 $ 4.61                                        
Weighted-Average Remaining Contractual Term                                                                      
Outstanding at the beginning of the period                         3 years 4 months 6 days 6 years 11 months 12 days 7 years 5 months 19 days 8 years 3 months 4 days                                      
Granted                         2 years 5 months 8 days 9 years 4 months 2 days 9 years 5 months 8 days                                        
Exercised                         5 years 8 months 1 day 6 years 8 months 23 days 7 years 11 months 1 day                                        
Outstanding at the end of the period                         3 years 4 months 6 days 6 years 11 months 12 days 7 years 5 months 19 days 8 years 3 months 4 days                                      
Vested at the end of the period                         7 years 10 months 24 days 6 years 2 months 8 days 6 years 10 months 2 days                                        
Exercisable at the end of the period                         7 years 10 months 24 days 6 years 2 months 8 days 6 years 10 months 2 days                                        
Nonvested Options                                                                      
Nonvested outstanding at the beginning of the period (in shares)                         293,000 341,000 503,000                                        
Granted (in shares)         0               100,000 202,000 86,000                                        
Vested (in shares)                         (143,000) (212,000) (232,000)                                        
Forfeited (in shares)                         (43,000) (38,000) (16,000)                                        
Nonvested outstanding at the end of the period (in shares)                         207,000 293,000 341,000 503,000                                      
Nonvested Options, Weighted Average Grant-Date Fair Value                                                                      
Nonvested at the beginning of the period (in dollars per share)                         $ 1.28 $ 1.13 $ 0.96                                        
Granted (in dollars per share)                         $ 3.62 $ 1.27 $ 1.60                                        
Vested (in dollars per share)                         $ 3.17 $ 1.07 $ 0.94                                        
Forfeited (in dollars per share)                         $ 3.33 $ 1.10 $ 0.95                                        
Nonvested at the end of the period (in dollars per share)                         $ 3.55 $ 1.28 $ 1.13 $ 0.96                                      
Restricted Stock Activity                                                                      
Intrinsic value of the fully-vested awards (in dollars)                                                                   49,000  
Restricted Stock                                                                      
Granted (in shares)                                                                   25,000  
Outstanding at the end of period (in shares)                                                                   25,000 25,000
Weighted-Average Grant Date Fair Value                                                                      
Granted (in dollars per share)                                                                   $ 2.96  
Outstanding at the end of period (in dollars per share)                                                                   $ 2.96 $ 2.96
Unrecognized compensation expense related to non-vested restricted stock grants (in dollars)                                                             52,000        
Awards granted that were immediately vested (in shares)                                                             0 0 0    
Unrecognized compensation expense                                                                      
Unrecognized compensation expense related to non-vested stock options (in dollars)                         $ 200,000                                            
Weighted-average period over which unrecognized expense is expected to be recognized 1 year 5 months 1 day                                                                    
Awards granted that were immediately vested (in shares)                         0 0 0                                        
Employee Stock Purchase Plan                                                                      
Shares issuable in any one calendar year                     100,000                                                
Purchase price per share as a percentage of fair market value                     95.00%                                                
Number of shares available for issuance                     92,473