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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2017 | Aug. 31, 2016
Impairment of Long-Lived Assets to be Disposed of |  | $ 0 | $ 0 |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 8,639,000 | 8,639,000 |  |
Goodwill, Impairment Loss |  | $ 0 | $ 0 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 34.00% | 34.00% |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ (1,100,000) |  |  |
Accounting Standards Update 2016-09 [Member] | Additional Paid-in Capital [Member] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | $ 1,000 |
Accounting Standards Update 2016-09 [Member] | AOCI Attributable to Parent [Member] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | $ (1,000) |
Scenario, Forecast [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |  |
RES-440 [Member] |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  |  |  |  | $ 0
Minimum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 2 years |  |  |
Maximum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 15 years |  |  |
Fair Value, Inputs, Level 3 [Member] | Convertible Note, Series B [Member] |  |  |  |  |
Convertible Debt, Fair Value Disclosures |  | $ 600,000 | $ 600,000 |  |
Fair Value, Inputs, Level 3 [Member] | The 2016 Convertible Notes [Member] |  |  |  |  |
Convertible Debt, Fair Value Disclosures |  |  | $ 2,000,000 |  |

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