Note 7 - Income Taxes - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax liabilities:
Net book value of property and equipment	$ 26,620	$ 20,986
Broadcast licenses, goodwill and other intangibles	369,275	350,647
Total deferred tax liabilities	395,895	371,633
Deferred tax assets:
Liability for accrued vacation	2,232	2,172
Liability for accrued bonus	5,483	4,786
Loan acquisition costs	336	391
Allowance for doubtful accounts	1,168	700
Liability under health and welfare plan	1,201	1,108
Liability for pension plan	13,278	14,172
Federal operating loss carryforwards	20,401	38,466
State and local operating loss carryforwards	4,555	5,867
Alternative minimum tax carryforwards	386	386
Unearned income	3	73
Stock options	174	163
Acquisition costs	3,140	1,129
Restricted stock	1,950	1,875
Other	109	172
Total deferred tax assets	54,416	71,460
Valuation allowance for deferred tax assets	(1,532)	(1,683)
Net deferred tax assets	52,884	69,777
Deferred tax liabilities, net of deferred tax assets	$ 343,011	$ 301,856