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Note 8 - Income Taxes - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax liabilities: |  |
Net book value of property and equipment | $ 21,097 | $ 18,131
Broadcast licenses, goodwill and other intangibles | 286,299 | 272,330
Total deferred tax liabilities | 307,396 | 290,461
Deferred tax assets: |  |
Liability for accrued vacation | 1,461 | 1,438
Liability for accrued bonus | 3,993 | 2,391
Allowance for doubtful accounts | 1,358 | 1,170
Liability under health and welfare plan | 639 | 608
Liability for pension plan | 8,437 | 9,611
State and local operating loss carryforwards | 2,358 | 4,719
Alternative minimum tax carryforwards |  | 3,925
Acquisition costs | 1,946 | 2,104
Restricted stock | 2,083 | 2,636
Other | 231 | 244
Total deferred tax assets | 22,506 | 28,846
Valuation allowance for deferred tax assets |  | (75)
Net deferred tax assets | 22,506 | 28,771
Deferred tax liabilities, net of deferred tax assets | $ 284,890 | $ 261,690

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