STOCK-BASED COMPENSATION - Liability-Classified Stock Compensation Activity (Details) - 2001 Stock Option Plan - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2010	Dec. 31, 2009
Stock-based compensation
Award plan, number of common stock that may be issued				500,000
Stock Option
Stock-based compensation
Awards available for issue ( in shares)			0
Shares
Outstanding (in shares)	11,000
Granted (in shares)	0	0
Expired (in shares)	(5,000)
Outstanding (in shares)	6,000
Exercisable (in shares)	6,000
Weighted Average Fair Value
Outstanding (in dollars per share)	$ 63.87
Expired (in dollars per share)	77.25
Outstanding (in dollars per share)	52.73
Exercisable (in dollars per share)	$ 52.73
Weighted Average Remaining Contractual Term
Outstanding	6 months 26 days
Exercisable	6 months 26 days
Stock-based compensation
Aggregate Intrinsic Value, Outstanding (in dollars)	$ 25,320
Aggregate Intrinsic Value, Exercisable (in dollars)	$ 25,320
Stock Appreciation Rights
Shares
Outstanding (in shares)	11,000
Granted (in shares)	0	0
Expired (in shares)	(5,000)
Outstanding (in shares)	6,000
Exercisable (in shares)	6,000
Weighted Average Fair Value
Outstanding (in dollars per share)	$ 1.33
Outstanding (in dollars per share)	2.63
Exercisable (in dollars per share)	$ 2.63
Weighted Average Remaining Contractual Term
Outstanding	6 months 26 days
Share based compensation, Weighted Average Remaining Contractual Term, Exercisable	6 months 26 days
Aggregate Intrinsic Value
Outstanding	$ 13,634
Exercisable	$ 13,634