Represents the period after a change of control within which, if employment of the individual is either terminated without cause or due to resignation for good reason, the equity award will be fully vested, as defined under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

STOCK-BASED COMPENSATION - Performance Share Awards - Peer Group Market Condition Vesting (Details) - USD ($) $ / shares in Units, $ in Millions							6 Months Ended
	Feb. 24, 2020	Feb. 11, 2020	Jan. 23, 2019	Jan. 24, 2018	Aug. 04, 2017	Feb. 03, 2017	Jun. 30, 2020
Stock-based compensation
Total shareholders percentage							15.18%
Vested							30,689
Shares
Outstanding (in shares)							188,870
Granted (in shares)							39,092
Vested (in shares)							(30,689)
Forfeited (in shares)							(200)
Outstanding (in shares)							197,073
Peer Group Market Condition Vesting \| Equity Award Agreements
Award agreements
Period after change of control for equity award to fully vest upon termination of employment without cause or resignation					24 months
Performance Shares
Stock-based compensation
Vesting percentage							112.50%
Performance period	3 years		3 years
Performance Shares \| Peer Group Market Condition Vesting
Stock-based compensation
Performance period				3 years		3 years
Vested		14,214					12,635
Shares
Outstanding (in shares)							49,275
Granted (in shares)	19,641		21,195	15,445		12,635	19,641
Vested (in shares)		(14,214)					(12,635)
Outstanding (in shares)							56,281
Weighted Average Fair Value
Outstanding (in dollars per share)							$ 65.59
Granted (in dollars per share)							54.69
Vested (in dollars per share)							54.66
Outstanding (in dollars per share)							$ 64.02
Compensation cost
Unrecognized compensation cost							$ 1.8
Weighted average period of recognition of unrecognized compensation cost							1 year 10 months 24 days
Performance Shares \| Minimum \| Peer Group Market Condition Vesting
Stock-based compensation
Vesting percentage	0.00%		0.00%	0.00%		0.00%
Performance Shares \| Maximum \| Peer Group Market Condition Vesting
Stock-based compensation
Vesting percentage	150.00%		150.00%	150.00%		150.00%
Stock Option Awards \| Amended and Restated 2010 Equity Incentive Plan \| Equity Award Agreements
Award agreements
Period after change of control for equity award to fully vest upon termination of employment without cause or resignation					24 months