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STOCK-BASED COMPENSATION - 2015 EIP Stock Options and Other (Details) - 2015 EIP Plan - Stock Options - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Feb. 23, 2021	Feb. 25, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021
Stock options
Vesting percentage of awards	33.33%
Vesting period	3 years
Unrecognized compensation cost
Unamortized compensation cost					$ 823
Future amortization of stock based compensation
Remainder of 2021					456
2022					278
2023					81
2023					$ 8
Number of Options
Outstanding at beginning of period (in shares)			837,338
Granted (in shares)	118,552	344,568	118,552
Exercised (in shares)			(16,742)
Outstanding at end of period (in shares)			939,148
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)			$ 8.86
Granted (in dollars per share)	$ 9.91	$ 7.06	9.91
Exercised (in dollars per share)			7.47
Outstanding at end of period (in dollars per share)			9.02
Weighted Average Fair Value
Outstanding at beginning of period (in dollars per share)			4.02
Granted (in dollars per share)	$ 4.33		4.33
Exercised (in dollars per share)			2.72
Outstanding at end of period (in dollars per share)			$ 4.08
Options outstanding and unvested					427,318
Weighted Average Exercise Price Of Outstanding and Unvested Options					$ 8.04
Options Outstanding and Unvested, Weighted Average Remaining Contractual Life			5 years
Options Exercisable, Number of options					511,830
Options Exercisable, Weighted Average Exercise Price					$ 9.84
Options Exercisable, Weighted Average Fair Value (in dollars per share)			$ 5.00
Options Exercisable, Weighted Average Remaining Contractual Life			3 years 4 months 17 days
Aggregate fair value	$ 513	$ 693
Stock options outstanding			939,148		939,148
Assumptions and Methodology
Weighted average volatility rate (as a percent)	60.91%
Risk-free interest rate ( as a percent)	0.41%
Dividend rate ( as a percent)	0.98%
Expected life (in years)	4 years
General and Administrative Expense
Stock options
Amortization expense			$ 180	$ 205

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