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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Property, Plant and Equipment, Useful Life |  | 5 years |
Deferred Revenue, Current |  | $ 2,763 | $ 1,099
Deferred Tax Assets, Gross |  | 172,131 | 168,890
Deferred Tax Assets, Valuation Allowance |  | 172,131 | $ 168,890
Accounting Standards Update 2016-09 [Member] |  |  |
Deferred Tax Assets, Gross |  | 3,600 |
Deferred Tax Assets, Valuation Allowance |  | $ 3,600 |
Accounting Standards Update 2014-09 [Member] | Scenario, Forecast [Member] |  |  |
Cumulative Effect on Retained Earnings, before Tax | $ 1,900 |  |
Sales Revenue, Goods, Gross | 2,900 |  |
Sales Allowances, Goods | $ 1,000 |  |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | SUSTOL [Member] |  |  |
Number of Major Customers |  | 2 |

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