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ACQUISITIONS AND DISPOSITIONS (Details Textual) - USD ($)
 1 Months Ended 6 Months Ended
Aug. 08, 2018
May 02, 2017
Jan. 30, 2017
Jun. 30, 2017
Aug. 09, 2018
Business Acquisition [Line Items]          
Proceeds from Divestiture of Businesses     $ 25,000,000    
Sale Leaseback Transaction, Net Proceeds, Investing Activities   $ 25,000,000      
Sale And Leaseback Transaction Gain   $ 22,500,000      
Sale and Leaseback Transaction, Gain (Loss), Net       $ 14,400,000  
Sale Leaseback Transaction, Deferred Gain, Net       $ 8,100,000  
Business Acquisition Purchase Price Allocation Indefinite Live Intangible Assets Land And Land Improvements         $ 1,100,000
Business Acquisition Purchase Price Allocation Indefinite Live Intangible Assets Towers         512,000
Proceeds from Property Plant and Equipment Received in Cash $ 12,200,000        
Red Zebra Broadcasting [Member]          
Business Acquisition [Line Items]          
Business Acquisition Purchase Price Allocation Indefinite Lived Intangible Assets, Radio Broadcasting Licenses         2,000,000
Business Acquisition Purchase Price Allocation Indefinite Lived Intangible Assets Including Goodwill         91,000
Business Acquisition Purchase Price Allocation Indefinite Live Intangible Assets Advertiser Agreements         206,000
Business Acquisition Purchase Price Allocation Indefinite Live Intangible Assets Other Property And Equipment         $ 254,000
Detroit radio station [Member]          
Business Acquisition [Line Items]          
Proceeds from Sale of Property Held-for-sale $ 12,700,000