ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)		3 Months Ended				6 Months Ended		12 Months Ended
	Jan. 02, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jan. 01, 2019	Dec. 20, 2018	Apr. 18, 2017	Nov. 30, 2016	Apr. 10, 2015
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revising opening retained earnings								$ 3,559,000	$ 3,600,000
Long-term Debt, Gross								350,000,000
Debt Instrument, Fair Value Disclosure								$ 332,500,000
Debt Instrument, Interest Rate, Stated Percentage								9.25%
Reassessed Estimated Fair Value of Award			$ 26,400,000			$ 26,400,000		$ 25,700,000
Related Party Transaction, Due from (to) Related Party, Total			869,000			869,000		208,000
Revenues			121,571,000		$ 115,206,000	220,020,000	$ 214,827,000
Operating Income (Loss)			30,546,000		24,813,000	46,663,000	32,128,000
Operating Expenses, Total			91,025,000		90,393,000	173,357,000	182,699,000
Unearned Event Income			3,848,000		2,368,000	3,848,000	2,368,000	3,864,000
Selling, General and Administrative Expense, Total			44,816,000		40,648,000	77,955,000	75,883,000
Impairment of Long-Lived Assets Held-for-use			3,800,000		0	3,800,000	6,556,000
Operating Lease, Right-of-Use Asset			49,226,000			49,226,000		$ 0
Operating Lease, Liability			53,660,000			53,660,000
Deferred Income Tax Expense (Benefit)						(2,542,000)	2,674,000
Accounting Standards Update 2016-02 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Operating Lease, Right-of-Use Asset									49,800,000
Operating Lease, Liability									54,100,000
Cumulative Effect on Retained Earnings, Net of Tax	$ 5,800,000
Deferred Rent Credit									$ 4,300,000
Barter Transactions [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax			572,000		711,000	1,100,000	1,500,000
Cost of Goods and Services Sold			422,000		670,000	837,000	1,400,000
Adjustment in Revenue					1,700,000		2,000,000
Marketing Services Fee Receivable			2,000,000			2,000,000
Selling, General and Administrative Expense, Total			150,000		41,000	301,000	81,000
Radio broadcasting and Reach Media segments [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees			6,100,000		6,400,000	11,000,000	11,700,000
Fantastic Voyage [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Operating Income Guarantee Through 2018 and 2019						1,700,000
Operating Income Guarantee Through 2020 and Thereafter						$ 1,750,000
Launch Support Assets [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Finite Lived Intangible Assets Weighted Average Amortization Period						7 years 9 months 18 days		7 years 9 months 18 days
Finite Lived Intangible Assets Remaining Weighted Average Amortization Period						5 years 7 months 6 days		6 years 1 month 6 days
Amortization of Intangible Assets			105,000		106,000	$ 211,000	211,000
Selling, General and Administrative Expense, Total			153,000		0	304,000	0
Detroit Market Radio Broadcasting Licenses [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment of Long-Lived Assets Held-for-use			3,800,000			3,800,000	3,800,000
Charlotte Market Radio Broadcasting Licenses [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment of Long-Lived Assets Held-for-use							2,700,000
Tom Joyner Foundation Inc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Related Party Transaction, Due from (to) Related Party, Total			34,000			34,000		$ 34,000
Reimbursement Expenditure Guarantee						$ 1,000,000
Percentage of Performance Bonus						50.00%
Tom Joyner Foundation Inc [Member] | Fantastic Voyage [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Operating Income Guarantee						$ 250,000
Tom Joyner Limited [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Related Party Transaction, Due from (to) Related Party, Total			2,000			2,000		$ 2,000
Chief Executive Officer [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Percentage Of Award Amount								4.00%
Senior Subordinated Notes due February 2020 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross			$ 0			$ 0		$ 2,000,000
Debt Instrument, Fair Value Disclosure								2,000,000
Debt Instrument, Interest Rate, Stated Percentage			9.25%			9.25%
Senior Subordinated Notes due March 2022 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross			$ 350,000,000			$ 350,000,000
Debt Instrument, Fair Value Disclosure			$ 351,800,000			$ 351,800,000
Debt Instrument, Interest Rate, Stated Percentage			7.375%			7.375%
MGM National Harbor Loan [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross			$ 51,100,000			$ 51,100,000
Debt Instrument, Face Amount			50,000,000			50,000,000
Other Income						3,400,000	3,400,000
ABL Facility [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross			9,000,000			9,000,000		0
Debt Instrument, Fair Value Disclosure			9,000,000			9,000,000
Tv One Llc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees			$ 3,800,000		3,500,000	$ 7,500,000	6,900,000
Reach Media Inc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			80.00%			80.00%
Reach Media Inc [Member] | Fantastic Voyage [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenues			$ 10,400,000		9,300,000	$ 10,400,000	9,300,000
Operating Income (Loss)						1,700,000	1,700,000
Operating Expenses, Total						8,700,000	7,600,000
Customer Advances [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenues			613,000		288,000	613,000	288,000
Unearned Event Income					4,100,000		4,100,000
Unearned Income [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenues			2,000,000		1,700,000	2,000,000	1,700,000
2017 Credit Facility [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross			322,300,000			322,300,000		323,900,000			$ 350,000,000
Debt Instrument, Fair Value Disclosure			309,400,000			309,400,000		305,800,000
Debt Instrument, Interest Rate, Stated Percentage											2.00%
Debt Instrument, Face Amount											$ 350,000,000
2018 Credit Facility [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross			177,800,000			177,800,000		192,000,000
Debt Instrument, Fair Value Disclosure			181,400,000			181,400,000		$ 195,900,000
Debt Instrument, Interest Rate, Stated Percentage								12.875%
Debt Instrument, Face Amount										$ 192,000,000
Staffing And Recruiting Services [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Related Party Transaction, Amounts of Transaction			$ 0		3,000	$ 0	25,000
Comcast Note [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross								$ 11,900,000
Debt Instrument, Fair Value Disclosure								11,900,000
Debt Instrument, Interest Rate, Stated Percentage			10.47%			10.47%
Debt Instrument, Face Amount			$ 11,900,000			$ 11,900,000
MGM National Harbor [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross			51,100,000			51,100,000		50,100,000
Debt Instrument, Fair Value Disclosure			57,200,000			57,200,000		$ 56,100,000
Investment Owned, at Cost												$ 35,000,000	$ 5,000,000
Other Income			1,600,000		1,800,000
Adjustments
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Deferred Income Tax Expense (Benefit)		$ 200,000		$ 3,400,000
Employment Agreement Award [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Selling, General and Administrative Expense, Total			$ 806,000		$ 1,600,000	$ 2,700,000	$ 2,800,000