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Note 13 - Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Accrued expenses | $ 22,758 | $ 18,982
Deferred revenue | 10,645 | 9,389
Inventories | 10,159 | 9,772
Pension obligations | 7,512 | 7,684
Stock-based compensation | 7,291 | 7,974
Operating loss and credit carryforwards | 20,927 | 15,677
Other | 2,822 | 2,842
Valuation allowance | (4,362) | (1,523)
Total deferred tax assets | 77,752 | 70,797
Goodwill and intangible assets | 58,133 | 12,455
Depreciation | 25,194 | 19,507
Debt refinancing costs | 7,193 | 7,732
Prepaid expenses | 1,173 | 1,241
Total deferred tax liabilities | 91,693 | 40,935
Net deferred tax assets (liabilities) | $ (13,941) |
Net deferred tax assets (liabilities) |  | $ 29,862

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