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Note 13 - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Goodwill and intangible assets |  | $ 23,624
Accrued expenses | $ 18,982 | 18,191
Deferred revenue | 9,389 | 7,945
Inventories | 9,772 | 9,177
Pension obligations | 7,684 | 8,738
Stock-based compensation | 7,974 | 8,628
Operating loss and credit carryforwards | 15,677 | 10,047
Other | 2,842 | 1,428
Valuation allowance | (1,523) | (1,385)
Total deferred tax assets | 70,797 | $ 86,393
Goodwill and intangible assets | 12,455 |
Depreciation | 19,507 | $ 18,535
Debt refinancing costs | 7,732 | 10,925
Prepaid expenses | 1,241 | 1,032
Total deferred tax liabilities | 40,935 | 30,492
Net deferred tax assets | $ 29,862 | $ 55,901

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