DEBT AND CREDIT ARRANGEMENTS - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt	$ 25,433	$ 25,452
Less: current maturities	114	113
Total long-term debt, net of current maturities	25,319	25,339
Note payable to Squadron
Debt Instrument [Line Items]
Long-term debt	20,000	20,000
Revolving credit facility with Squadron | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	3,930	3,921
Mortgage payable to affiliate
Debt Instrument [Line Items]
Long-term debt	1,503	1,531
Less: current maturities	$ 114	$ 113