SUBSEQUENT EVENTS (Narrative) (Details)				3 Months Ended	6 Months Ended
	Jul. 06, 2022 USD ($) $ / shares shares	Jul. 05, 2022 USD ($) director shares	Jul. 06, 2021 USD ($) director shares	Jun. 30, 2022 USD ($) $ / shares	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2021 USD ($)
Subsequent Event [Line Items]
Stock Repurchased During Period, Value | $					$ 24,669,000	$ 905,000
Common Class D [Member]
Subsequent Event [Line Items]
Stock Repurchased During Period, Shares | shares					4,665,589
Stock Repurchased During Period, Value | $				$ 24,600,000	$ 24,600,000
Repurchase Of Common Stock Price Per Share | $ / shares				$ 5.26	$ 5.26
Common Class D [Member] | Four Non-Executive Directors [Member] | Restricted stock awards [Member]
Subsequent Event [Line Items]
Number of non-executive directors, received awards | director			4
Vesting period			2 years
Restricted stock issued | shares			9,671
Stock issued during period, value, restricted stock award fair value | $			$ 50,000
Subsequent events | Common Class D [Member]
Subsequent Event [Line Items]
Stock Repurchased During Period, Shares | shares	100,803
Stock Repurchased During Period, Value | $	$ 439,000
Repurchase Of Common Stock Price Per Share | $ / shares	$ 4.30
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | shares	0
Subsequent events | Common Class D [Member] | Four Non-Executive Directors [Member] | Restricted stock awards [Member]
Subsequent Event [Line Items]
Number of non-executive directors, received awards | director		4
Vesting period		2 years
Restricted stock issued | shares		11,848
Stock issued during period, value, restricted stock award fair value | $		$ 50,000