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Note 15 - Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accrued expenses | $ 21,053 | $ 16,745
Deferred revenue | 14,697 | 12,418
Inventories | 9,879 | 8,500
Pension obligations | 0 | 1,062
Stock-based compensation | 7,490 | 5,960
Operating loss and credit carryforwards | 28,356 | 25,585
Bad debt | 1,094 | 1,363
Other | 4,275 | 2,516
Valuation allowance | (5,024) | (5,802)
Total deferred tax assets | 81,820 | 68,347
Goodwill and intangible assets | 142,159 | 108,899
Depreciation | 27,864 | 25,429
Debt refinancing costs | 4,119 | 4,206
Prepaid expenses | 1,073 | 950
Total deferred tax liabilities | 175,215 | 139,484
Net deferred tax liabilities | $ (93,395) | $ (71,137)

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