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DEBT (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Mar. 31, 2016
item
Debt Instruments      
Aggregate principal amount $ 5,364,000    
Capital lease obligations 813,000    
Notes payable      
Aggregate principal amount outstanding 5,364,000    
Aggregate maturities of notes payable      
July 2016 - June 2017 4,856,000    
July 2017 - June 2018 508,000    
Total 5,364,000    
Future minimum lease payments      
July 2016 - June 2017 646,000    
July 2017 - June 2018 167,000    
Total minimum lease payments required $ 813,000    
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 $ 1,714,000    
Number of notes payable not covered under term loan feature | item 2    
Aggregate principal amount not covered under term loan feature outstanding $ 3,439,000    
Percentage of maximum borrowing capacity on eligible accounts receivable 80.00%    
Minimum tangible net worth $ 150,000,000    
Notes payable      
Aggregate principal amount outstanding 1,714,000    
Aggregate maturities of notes payable      
Total 1,714,000    
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 $ 5,153,000 $ 8,654,000  
Notes payable      
Aggregate principal amount outstanding $ 5,153,000 $ 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 $ 5,153,000 $ 8,654,000  
Notes payable to finance companies for insurance      
Debt Instruments      
Number of notes payable | item     1
Aggregate principal amount 211,000 838,000  
Notes payable      
Aggregate principal amount outstanding $ 211,000 $ 838,000  
Interest rate (as a percent) 2.35% 2.35%  
Aggregate maturities of notes payable      
Total $ 211,000 $ 838,000