DEBT (Details) $ in Thousands	Mar. 28, 2017	Apr. 30, 2015	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Apr. 29, 2015 USD ($)
Line of Credit Facility [Line Items]
Line of credit			$ 17,392	$ 0
BMO Harris Bank [Member] | 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%
Letters of Credit Outstanding, Amount			893
Fixed charge coverage ratio	1.00
Line of credit			17,392
Line of Credit Facility, Remaining Borrowing Capacity			$ 32,112
BMO Harris Bank [Member] | 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%
BMO Harris Bank [Member] | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) [Member] | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.50%
BMO Harris Bank [Member] | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) [Member] | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.75%