STOCK COMPENSATION PLANS (Details)			3 Months Ended		9 Months Ended
	May 03, 2022 $ / shares shares	May 04, 2021 $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Director $ / shares shares	Sep. 30, 2021 USD ($)
Stock Compensation Plans [Abstract]
Compensation expense					$ 162,000	$ 142,000
Number of directors in committee | Director					3
Total intrinsic value of options exercised			$ 1,894,000
Shares of Class A Non-Voting Common Stock under option [Abstract]
Exercised/vested and released, aggregate intrinsic value			$ 1,894,000
Class A Stock [Member] | Stock Options [Member]
Stock Compensation Plans [Abstract]
Total intrinsic value of options exercised					$ 1,894,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period, option shares (in shares) | shares					83,000
Granted, option shares (in shares) | shares					0
Exercised/vested and released, option shares (in shares) | shares					(66,104)
Expired/cancelled, option shares (in shares) | shares					0
Outstanding at end of period, option shares (in shares) | shares			16,896		16,896
Exercisable/vested at end of period, option share (in shares) | shares			16,896		16,896
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period, weighted average exercise price (in dollars per shares) | $ / shares					$ 21.65
Granted, weighted average exercise price (in dollars per share) | $ / shares					0
Exercised/vested and released, weighted average exercise price (in dollars per shares) | $ / shares					21.65
Expired/cancelled, weighted average exercise price (in dollars per share) | $ / shares					0
Outstanding at end of period, weighted average exercise price (in dollars per shares) | $ / shares			$ 21.86		21.86
Options exercisable at year end (in dollars per shares) | $ / shares			$ 21.86		$ 21.86
Shares of Class A Non-Voting Common Stock under option [Abstract]
Outstanding at end of period, weighted average remaining life					1 year 7 months 6 days
Exercisable/vested at end of period, weighted average remaining life					1 year 7 months 6 days
Outstanding at beginning of period, aggregate intrinsic value					$ 2,048,000
Granted, aggregate intrinsic value					0
Exercised/vested and released, aggregate intrinsic value					1,894,000
Expired/cancelled, aggregate intrinsic value					0
Outstanding at end of period, aggregate intrinsic value			$ 444,000		444,000
Exercisable/vested at end of period, aggregate intrinsic value			444,000		444,000
Class A Stock [Member] | Stock Options [Member] | 2015 Equity Compensation Plan [Member]
Stock Compensation Plans [Abstract]
Unrecognized expense related to non-vested option shares			0		0
Class A Stock [Member] | Restricted Stock [Member]
Stock Compensation Plans [Abstract]
Compensation expense			$ 57,000	$ 51,000	$ 162,000	$ 142,000
Fair value per share (in dollars per share) | $ / shares	$ 45.58	$ 40.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted, option shares (in shares) | shares	5,000	5,000
Shares [Roll Forward]
Outstanding at beginning of year (in shares) | shares					5,000
Granted (in shares) | shares					5,000
Exercised/vested and released, restricted stock awards (in shares) | shares					(5,000)
Cancelled (in shares) | shares					0
Unvested Outstanding at end of year (in shares) | shares			5,000		5,000
Weighted Average Grant Date Fair Value [Abstract]
Outstanding at beginning of year (in dollars per shares) | $ / shares					$ 40.11
Granted, weighted average grant date fair value (in dollars per share) | $ / shares					45.58
Vested and released, weighted average grant date fair value (in dollars per shares) | $ / shares					40.11
Cancelled, weighted average grant date fair value (in dollars per share) | $ / shares					0
Unvested Outstanding at end of year (in dollars per shares) | $ / shares			$ 45.58		$ 45.58
Class A Stock [Member] | Restricted Stock [Member] | 2015 Equity Compensation Plan [Member]
Stock Compensation Plans [Abstract]
Unrecognized expense related to non-vested option shares			$ 134,000		$ 134,000
Period over which unvested options cost will recognized					7 months 2 days