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Note 12 - Commitments and Contingencies (Details Textual) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 09, 2015 USD ($) ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Operating Leases, Rent Expense, Total |  | $ 1,800 | $ 1,800 | $ 1,300
Standard and Extended Product Warranty Accrual, Ending Balance |  | $ 0 | 0 |
European Headquarters Facility [Member] |  |  |  |
Area of Real Estate Property | ft² | 33,000 |  |  |
Lessee Leasing Arrangements, Term of Contract | 15 years |  |  |
Lessee Leasing Arrangements, Number of Renewal Terms | 3 |  |  |
Lessee Leasing Arrangements, Renewal Term | 6 years |  |  |
Lessee Leasing Arrangements Ability to Withdraw With Penalty | 6 years |  |  |
Lessee Leasing Arrangements Ability to Withdrawn Without Penalty | 9 years |  |  |
Lessee Leasing Arrangements Initial Yearly Rent | $ 300 |  |  |
Construction in Progress, Gross |  |  | 3,100 |
European Headquarters Facility [Member] | Deposits and Other Assets, Noncurrent [Member] |  |  |  |
Lessee Leasing Arrangements, Additional Tenant Improvements |  |  | $ 800 |

X
- Definition Term of the lessee's leasing arrangement ability to withdraw with penalties, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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