STOCKHOLDERS' EQUITY - Stock Option Activity (Details) - Stock Options. - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Shares
Outstanding at beginning of period (in shares)	16,168
Granted (in shares)	2,250	4,500
Exercised (in shares)	(250)
Outstanding at end of period (in shares)	18,168	16,168
Exercisable at end of period (in shares)	10,499
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per shares)	$ 14.40
Granted (in dollars per share)	8.91
Exercised (in dollars per share)	7.54
Outstanding at end of period (in dollars per share)	13.81	$ 14.40
Exercisable at end of period (in dollars per share)	15.41
Other disclosures
Weighted-average grant date fair value of options granted (in dollars per share)	$ 3.43	$ 4.02
Total intrinsic value of options exercised (in dollars)	$ 490	$ 2,160