SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassifications, Share based Compensation, Earnings per Common Share, Share Repurchase Program & Restricted Cash (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2010	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Aug. 31, 2018	Jan. 01, 2018	Dec. 31, 2017		May 31, 2017
Retained Earnings		$ 5,632		$ 5,632				$ 3,889	[1]
Equity Appreciation Rights Plan
Shares granted (in units)			0
Restricted Cash
Outstanding letters of credit		0		0
August 2017, Share Repurchase Program
Share Repurchase Program
Share repurchase program authorized amount		$ 250		$ 250
Stock repurchased in open market transactions (in shares)		2,277	4,824	55,199	4,824
Stock repurchased in open market transactions		$ 8	$ 16,909	$ 200	$ 16,909
August 2018, Share Repurchase Program
Share Repurchase Program
Share repurchase program authorized amount						$ 250
Stock repurchased in open market transactions (in shares)		8,640		8,640
Stock repurchased in open market transactions		$ 35		$ 35
Authorized balance remaining under share repurchase program		215		215
ASU 2014-09
Retained Earnings		$ 5,632		$ 5,632			$ 1,381
Stock Options
Options
Balance at the beginning of the period(in shares)				187,750
Granted (in shares)		0		134,000
Cancelled (in shares)				(3,000)
Balance at the end of the period (in shares)		318,750		318,750
Exercisable at the end of the period (in shares)		87,750		87,750
Weighted-Average Exercise Price Per Share
Outstanding at the beginning of the period (in dollars per share)				$ 3.70
Granted (in dollars per share)				3.36
Cancelled (in dollars per share)				3.29
Outstanding at the end of the period (in dollars per share)		$ 3.62		3.62
Exercisable at the end of the period (in dollars per share)		$ 4.00		$ 4.00
Weighted- Average Remaining Contractual Term (in years)
Outstanding at the end of the period				8 years 3 months 7 days
Exercisable at the end of the period				5 years 11 months 19 days
Aggregate Intrinsic Value
Outstanding at the end of the period		$ 210		$ 210
Exercisable at the end of the period		54		54
Additional disclosures
Compensation expense (income)		35	17	80	26
Unrecognized compensation related to unvested awards		275		$ 275
Unrecognized compensation, vesting period				3 years 3 months 11 days
2005 Plan
Equity Appreciation Rights Plan
Shares granted (in units)				0
2017 Plan | Stock Options
Additional disclosures
Number of common shares authorized										350,000
2010 Plan | Equity Appreciation Rights Plan
Additional disclosures
Compensation expense (income)		$ 0	$ (4)	$ 0	$ (4)
Equity Appreciation Rights Plan
Vesting period from the base date	3 years
Shares granted (in units)		0		0	100,000
Accrued compensation		$ 0		$ 0				$ 0
2010 Plan | Equity Appreciation Rights Plan | Maximum
Additional disclosures
Number of common shares authorized	1,000,000
Equity Appreciation Rights Plan
Redemption cash payment period	90 days

[1] The balance sheet at December 31, 2017 has been derived from the audited financial statements at that date