STOCK-BASED COMPENSATION EXPENSE - Narrative (Details)			3 Months Ended		12 Months Ended
	Aug. 03, 2020 shares	Jan. 04, 2017 USD ($) shares	Sep. 30, 2020 shares	Jun. 30, 2020 shares	Dec. 31, 2020 USD ($) employee $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Mar. 31, 2020 USD ($) shares	Jun. 30, 2010 shares	Dec. 31, 2001 shares
Class of Stock [Line Items]
Outstanding (in shares)					417,000	450,000	613,000
Shares vested in period (in shares)					103,000
Period for recognition					3 years
Allocated share-based compensation expense | $					$ 299,000
Grant date weighted-average fair value, granted (in dollars per share) | $ / shares					$ 0.78	$ 1.54
Options exercised in period (in shares)					0	16,000
Proceeds from stock options exercised | $					$ 0	$ 42,000	$ 0
Unrecognized compensation cost related to non-vested shares | $						$ 12,000
Number of shares authorized to be repurchased (in shares)										1,000,000
Remaining number of shares authorized to be repurchased (in shares)					72,000
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Shares vested in period (in shares)					134,000	37,000
Shares outstanding (in shares)					13,000	3,000	4,000
Options granted in period (in shares)					144,000	36,000
Grant date weighted-average fair value, granted (in dollars per share) | $ / shares					$ 1.96	$ 2.50
Options
Class of Stock [Line Items]
Shares vested in period (in shares)					0
Allocated share-based compensation expense | $					$ 17,000	$ 141,000
Incentive Compensation Plan
Class of Stock [Line Items]
Shares reserved for future issuance (in shares)									1,630,000
Remaining shares available for grant (in shares)					437,000
Number of shares available for grant (in shares)					456,000
Incentive Compensation Plan | Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Shares vested in period (in shares)					210,000
Shares vested and outstanding (in shares)					233,000
Employee benefits and share-based compensation | $					$ 7,000
Offsetting tax benefit | $					1,000
Unrecognized compensation cost | $					$ 2,000
Period for recognition					6 months
Restricted stock units (in shares)					3,000	4,000
Fair value of options vested in period | $					$ 9,000	$ 11,000
Incentive Compensation Plan | Employee
Class of Stock [Line Items]
Shares issued for services (in shares)					20,000
Number of employees | employee					2
Incentive Compensation Plan | Non Employee Directors and Corporate Secretary
Class of Stock [Line Items]
Number of shares available for grant (in shares)					43,000
Executive Equity Awards
Class of Stock [Line Items]
Allocated share-based compensation expense | $					$ 195,000
Executive Equity Awards | Chief Executive Officer | Restricted Stock
Class of Stock [Line Items]
Award vesting period	30 days
Options granted in period (in shares)	10,000			50,000
Executive Equity Awards | Chief Executive Officer | Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Shares issued for services (in shares)					100,000
Shares vested in period (in shares)					90,000
Executive Equity Awards | Senior Vice President | Restricted Stock
Class of Stock [Line Items]
Shares issued for services (in shares)			10,000
Performance Share Award Agreement
Class of Stock [Line Items]
Unrecognized compensation cost | $								$ 421,000
Allocated share-based compensation expense | $		$ 108,000
Performance Share Award Agreement | Restricted Stock
Class of Stock [Line Items]
Options granted in period (in shares)		161,766
Amount of nonvested options (in shares)								129,000
Retainer Fees | Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Employee benefits and share-based compensation | $					$ 80,000
Retainer Fees | Incentive Compensation Plan | Non Employee Directors
Class of Stock [Line Items]
Number of shares available for grant (in shares)					293,000