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Note 1 - Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities |  |  | $ 0 | $ 0 | $ 0
Inventory, Net |  |  | 14,415 | 11,377 |
Inventory, Noncurrent |  |  | $ 8,708 | 1,664 |
Number of Reporting Units |  |  | 1 |  |
Goodwill, Impairment Loss | $ 12,724 |  | $ 12,724 |  |
Impairment of Intangible Assets, Finite-lived |  |  | $ 769 |  |
Product Return Policy, Number Of Days |  |  | 180 days |  |
Product Return Policy, Not to Exceed Net Purchases During Preceeding Quarter, Percent |  |  | 15.00% |  |
Advertising Expense |  |  | $ 1,079 | 836 | $ 728
Deferred Tax Assets, Valuation Allowance |  |  | $ 2,236 | 1,404 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 35.00% |  |
Increase (Decrease) of Net Deferred Tax Assets |  |  | $ (3,300) |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | 3,300 |  |
Scenario, Forecast [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% |  |  |
Customer Relationships [Member] |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  | $ 769 |  |
Minimum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 2 years |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 10 years |  |
Advance Replacement Units [Member] |  |  |  |  |
Inventory, Net |  |  | $ 76 | $ 21 |

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