INCOME TAXES - Components of deferred tax assets and liabilities (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Allowance for doubtful accounts	$ 2,084,000	$ 2,149,000
Accruals	2,722,000	304,000
Fixed assets		493,000
Stock-based compensation	615,000	521,000
Net operating loss carryforwards	57,428,000	89,377,000
Lease liability	8,084,000	8,901,000
Interest expense carryforward	21,977,000	23,788,000
Total deferred tax assets	92,910,000	125,533,000
Valuation allowance for deferred tax assets	(1,473,000)	(30,000)
Total deferred tax asset, net of valuation allowance	91,437,000	125,503,000
Deferred tax liabilities:
Intangible assets	(102,233,000)	(129,026,000)
Available-for-sale securities		(23,779,000)
Fixed assets	(873,000)
Right of use asset	(7,748,000)	(8,123,000)
Partnership interests	(283,000)	(2,412,000)
Deferred financing costs	(734,000)	(958,000)
Other	(107,000)	(150,000)
Uncertain tax positions	(397,000)	(444,000)
Total deferred tax liabilities	(112,375,000)	(164,892,000)
Net deferred tax liability	$ (20,938,000)	$ (39,389,000)