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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Share-Based Awards, Share Repurchase Program & Restricted Cash (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Nov. 30, 2010
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
 [1]
May 31, 2017
Retained Earnings   $ 5,073   $ 5,436  
Share Repurchase Program          
Stock repurchased   13 $ 126    
Restricted Cash          
Outstanding letters of credit   0      
August 2017, Share Repurchase Program          
Share Repurchase Program          
Share repurchase program authorized amount   $ 250      
Stock repurchased (in shares)   3,377      
Stock repurchased   $ 13      
2005 Plan          
Equity Appreciation Rights Plan          
Shares granted (in units)   0      
Stock Options          
Options          
Balance at the beginning of the period(in shares)   224,750      
Granted (in shares)   137,500      
Cancelled (in shares)   (23,250)      
Balance at the end of the period (in shares)   339,000      
Exercisable at the end of the period (in shares)   36,166      
Weighted-Average Exercise Price Per Share          
Outstanding at the beginning of the period (in dollars per share)   $ 3.44      
Granted (in dollars per share)   4.53      
Cancelled (in dollars per share)   3.85      
Outstanding at the end of the period (in dollars per share)   3.85      
Exercisable at the end of the period (in dollars per share)   $ 3.46      
Weighted- Average Remaining Contractual Term (in years)          
Outstanding at the end of the period   9 years 1 month 13 days      
Exercisable at the end of the period   7 years 8 months 16 days      
Aggregate Intrinsic Value          
Outstanding at the end of the period   $ 298      
Exercisable at the end of the period   46      
Additional disclosures          
Compensation expense (income)   43 20    
Unrecognized compensation related to unvested awards   $ 402      
Unrecognized compensation, vesting period   3 years 3 months 15 days      
Stock Options | 2017 Plan          
Additional disclosures          
Number of common shares authorized         350,000
Equity Appreciation Rights Plan | 2010 Plan          
Additional disclosures          
Compensation expense (income)   $ 0 $ 0    
Equity Appreciation Rights Plan          
Vesting period from the base date 3 years        
Shares granted (in units)   100,000      
Equity Appreciation Rights Plan | 2010 Plan | Maximum          
Additional disclosures          
Number of common shares authorized 1,000,000        
Equity Appreciation Rights Plan          
Redemption cash payment period 90 days        
Restricted Stock          
Additional disclosures          
Compensation expense (income)   $ 116      
Equity Appreciation Rights Plan          
Restricted shares awarded (in shares)   25,000      
[1] The balance sheet at December 31, 2018 has been derived from the audited financial statements at that date.