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Note 11 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax liabilities: |  |
Property, Plant and Equipment | $ 0 | $ 0
Intangible Assets | 4,631 | 4,462
Total deferred tax liabilities | 4,631 | 4,462
Deferred tax assets: |  |
Property, Plant and Equipment | 288 | 88
Net operating loss carryforwards | 27,283 | 20,164
Tax credit carryforwards | 1,596 | 1,455
Intangible assets | 3,391 | 3,841
Accrued expenses, reserves and other | 2,127 | 2,509
Total deferred tax assets | 34,685 | 28,057
Valuation allowance | (34,593) | (27,951)
Net deferred tax assets | 92 | 106
Net deferred tax liabilities | $ 4,539 | $ 4,356

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