LONG-TERM DEBT (Details)	3 Months Ended		12 Months Ended
	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014	Sep. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Nov. 15, 2011 USD ($)
Long-term debt
Current portion of long-term debt	$ 40,900,000		$ 40,900,000
Credit Facility
Long-term debt
Maximum borrowing capacity	48,500,000		$ 48,500,000
Number of trailing quarters during which certain financial ratios are to be maintained and minimum level of EBITDA is to be achieved (in months)			12 months
Amount in which the maximum borrowing capacity was permanently reduced	15,000,000	$ 20,000,000
Reduction in maximum borrowing capacity	1,500,000	$ 1,500,000	$ 1,500,000		$ 1,500,000	$ 1,500,000
Multiple which may be used to permanently reduce the maximum borrowing capacity under the credit facility			50,000
Current portion of long-term debt	$ 40,900,000		$ 40,900,000
Variable interest rate base				LIBOR
Percentage points added to the reference rate				1.50%
One-month LIBOR interest rate (as a percent)				0.17%
Credit Facility | Actual
Long-term debt
Leverage ratio			0.8
Fixed charge coverage ratio			42.0
Credit Facility | Minimum
Long-term debt
Amount in which the maximum borrowing capacity was permanently reduced			$ 500,000
Credit Facility | Minimum | Requirement
Long-term debt
Fixed charge coverage ratio			1.15
Credit Facility | Maximum | Requirement
Long-term debt
Leverage ratio			2.0
Old Credit Facility
Long-term debt
Maximum borrowing capacity							$ 60,000,000