ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Net Revenue	$ 130,966	$ 111,463	$ 107,593	$ 91,440	$ 113,542	$ 91,912	$ 76,008	$ 94,875	$ 441,462	$ 376,337
Radio Advertising [Member]
Net Revenue									165,244	137,849
Political Advertising [Member]
Net Revenue									3,494	22,484
Digital Advertising [Member]
Net Revenue									59,812	34,131
Cable Television Advertising [Member]
Net Revenue									95,589	79,732
Cable Television Affiliate Fees [Member]
Net Revenue									102,380	99,489
Event Revenues & Other [Member]
Net Revenue									$ 14,943	$ 2,652