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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 1,574 |  |  |  |  |  |  |  | $ 1,574 |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 28,844 | $ 19,786 | $ 17,277 | $ 11,567 | $ 10,053 | $ 8,572 | $ 8,510 | $ 3,632 | 77,474 | $ 30,767 | $ 1,279
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance |  | 25,503 |  |  |  | 9,319 |  |  |  | 25,503 | 9,319 |
Cost of Goods and Services Sold, Total |  | 11,572 | $ 7,576 | $ 5,231 | $ 3,133 | $ 1,338 | $ 1,051 | $ 1,013 | $ 1,186 | 27,512 | $ 4,588 | $ 35
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 2,900 |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold, Total | 200 |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Product Sales Allowance [Member] |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance | 1,100 |  |  |  |  |  |  |  |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 1,574 |  |  |  |  |  |  |  | $ 1,574 |  |
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 1,600 |  |  |  |  |  |  |  |  |  |  |

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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