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ACCOUNTS RECEIVABLE (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
State
Dec. 31, 2014
USD ($)
Dec. 31, 2013
ACCOUNTS RECEIVABLE [Abstract]      
Percentage of amounts financed under in-house credit programs, as a percent of net sales including sales tax 1.40% 1.70% 2.20%
Duration of no interest credit programs 12 months    
Term of other programs, minimum 30 days    
Term of other programs, maximum 3 years    
Interest rate of other programs, minimum 0.00%    
Interest rate of other programs, maximum 21.00%    
Accounts receivable due per scheduled payment [Abstract]      
Accounts receivables collectible in one year $ 6,243,000    
Accounts receivables collectible in two years 606,000    
Accounts receivables collectible in three years 125,000    
Accounts receivables collectible in four years 24,000    
Allowance for doubtful accounts $ 395,000 $ 350,000  
Account write-off period 9 months    
Number of states in which accounts receivable originated | State 16