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DEBT (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Debt Instruments    
Aggregate principal amount $ 7,430,000  
Capital lease obligations 1,006,000  
Notes payable    
Aggregate principal amount outstanding 7,430,000  
Aggregate maturities of notes payable    
April 2016 - March 2017 6,414,000  
April 2017 - March 2018 1,016,000  
Total 7,430,000  
Future minimum lease payments    
April 2016 - March 2017 727,000  
April 2017 - March 2018 279,000  
Total minimum lease payments required $ 1,006,000  
Minimum    
Future minimum lease payments    
Interest rate (as a percent) 3.16%  
Maximum    
Future minimum lease payments    
Interest rate (as a percent) 6.88%  
Credit Agreement    
Debt Instruments    
Borrowing, repaying and re-borrowing capacity $ 20,000,000  
Number of notes payable | item 1  
Aggregate principal amount $ 2,572,000  
Number of notes payable not covered under term loan feature | item 2  
Aggregate principal amount not covered under term loan feature outstanding $ 4,332,000  
Percentage of maximum borrowing capacity on eligible accounts receivable 80.00%  
Minimum tangible net worth $ 150,000,000  
Notes payable    
Aggregate principal amount outstanding 2,572,000  
Aggregate maturities of notes payable    
Total 2,572,000  
Credit Agreement | Letter Of Credit    
Debt Instruments    
Aggregate principal amount $ 1,767,000  
Credit Agreement | Minimum    
Debt Instruments    
Ratio of current assets to current liabilities 1.50  
Credit Agreement | Maximum    
Debt Instruments    
Interest rate 4.50%  
Debt to tangible net worth ratio 1.00  
Credit Agreement | Maximum | Prime rate    
Debt Instruments    
Interest rate floor 2.50%  
Notes payable to commercial banks    
Debt Instruments    
Aggregate principal amount $ 6,904,000 $ 8,654,000
Notes payable    
Aggregate principal amount outstanding $ 6,904,000 $ 8,654,000
Minimum interest rate (as a percent) 3.50% 3.50%
Maximum interest rate (as a percent) 4.50% 4.50%
Aggregate maturities of notes payable    
Total $ 6,904,000 $ 8,654,000
Notes payable to finance companies for insurance    
Debt Instruments    
Number of notes payable | item 1  
Aggregate principal amount $ 526,000 838,000
Notes payable    
Aggregate principal amount outstanding $ 526,000 $ 838,000
Interest rate (as a percent) 2.35% 2.35%
Aggregate maturities of notes payable    
Total $ 526,000 $ 838,000