Note 15 - Subsequent Events (Details Textual) - USD ($) $ in Millions			9 Months Ended
	Nov. 01, 2019	Oct. 01, 2019	Sep. 30, 2019	Sep. 30, 2018	Nov. 06, 2019
Repayments of Long-term Debt, Total			$ 11	$ 40
Subsequent Event [Member] | Repurchase Outstanding Common Stock (GTN) and/or Class A Common Stock (GTN,A) [Member]
Stock Repurchase Program, Authorized Amount					$ 150
Subsequent Event [Member] | The 2019 Term Loan [Member] | The 2019 Senior Credit Facility [Member]
Repayments of Long-term Debt, Total	$ 100
Subsequent Event [Member] | Charlottesville Acquisition [Member]
Payments to Acquire Businesses, Gross		$ 12