Note 13 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Aug. 07, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amortization of Intangible Assets, Total		$ 115,000	$ 21,000	$ 25,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months		103,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two		98,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three		94,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four		88,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five		24,000
Goodwill, Impairment Loss		0	0	0
Proceeds from Spectrum Auction		$ 0	$ 0	$ 91,000
FCC [Member]
Proceeds from Spectrum Auction	$ 91,000
FCC [Member] | Broadcast Licenses [Member]
Intangible Asset Dispositions from Spectrum Auction	$ 13,000