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DEBT - NARRATIVE (Details) - Line of credit
12 Months Ended
Oct. 01, 2019
USD ($)
quarter
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Revolving credit facility      
Debt Instrument [Line Items]      
Borrowing capacity $ 75,000,000.0    
Commitment fee on undrawn portion 0.60%    
Weighted average interest rate   4.70%  
Borrowing availability   $ 51,987,000  
Leverage Ratio, maximum 2.50    
Interest/rent coverage ratio, minimum 1.50    
Leverage Ratio, acquisition consummated, consecutive months 6 months    
Leverage Ratio, acquisition consummated, aggregate consideration paid $ 20,000,000    
Leverage Ratio, increased maximum 3.00    
Leverage Ratio, increased maximum, term | quarter 3    
Leverage Ratio less than then-applicable maximum Leverage Ratio, minimum 0.25    
Leverage Ratio less than then-applicable maximum Leverage Ratio, minimum, term | quarter 2    
Liquidity to Aggregate Revolving Commitment Amount ratio, maximum 10.00%    
Liquidity to Aggregate Revolving Commitment Amount ratio, maximum, term 10 days    
Debt outstanding   $ 20,000,000 $ 0
Revolving credit facility | Minimum | LIBOR      
Debt Instrument [Line Items]      
Margin   2.50%  
Revolving credit facility | Minimum | Base Rate      
Debt Instrument [Line Items]      
Margin   1.50%  
Revolving credit facility | Maximum | LIBOR      
Debt Instrument [Line Items]      
Margin   3.50%  
Revolving credit facility | Maximum | Base Rate      
Debt Instrument [Line Items]      
Margin   2.50%  
Letters of credit      
Debt Instrument [Line Items]      
Letters of credit outstanding   $ 3,013,000