DEBT (Details) - USD ($) $ in Thousands	Apr. 30, 2015	Jun. 30, 2016	Dec. 31, 2015	Apr. 29, 2015
Line of Credit Facility [Line Items]
Line of credit		$ 23,460	$ 32,214
BMO Harris Bank | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity				$ 50,000
Line of credit facility, maximum borrowing capacity				70,000
Increments for additional borrowing				5,000
Letters of credit, maximum allowed				5,000
Borrowing base, as percentage of eligible accounts receivables less reserves	85.00%
Fixed charge coverage ratio	1.10
Maximum limit for non-financed capital expenditures during 2016				$ 5,000
Line of credit		23,460
Line of Credit Facility, Remaining Borrowing Capacity		$ 20,323
BMO Harris Bank | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Description of variable rate basis	one-month LIBOR
Monthly unused fee, rate per annum	0.25%
Minimum | BMO Harris Bank | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
Maximum | BMO Harris Bank | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.50%