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Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 02, 2017
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 |  | $ (1,939) |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | (10,695) | $ (1,262) |
Deferred Tax Assets, Gross |  | 22,645 | 33,358 |
Unrecognized Tax Benefits |  | 0 | 0 |
Deferred Tax Assets, Valuation Allowance |  | 22,636 | $ 33,331 |
Domestic Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards |  | 69,594 |  |
Tax Credit Carryforward, Amount |  | $ 1,837 |  |
Domestic Tax Authority [Member] | Earliest Tax Year [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Open Tax Year |  | 2002 |  |
Domestic Tax Authority [Member] | Latest Tax Year [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Open Tax Year |  | 2017 |  |
Foreign Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards |  | $ 12,760 |  |
Foreign Tax Authority [Member] | Earliest Tax Year [Member] |  |  |  |
Open Tax Year |  | 2009 |  |
Foreign Tax Authority [Member] | Latest Tax Year [Member] |  |  |  |
Open Tax Year |  | 2017 |  |
State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |  |  |
Open Tax Year |  | 2002 |  |
State and Local Jurisdiction [Member] | Latest Tax Year [Member] |  |  |  |
Open Tax Year |  | 2017 |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |
Deferred Tax Assets, Gross |  |  |  | $ 1,123
Deferred Tax Assets, Valuation Allowance |  |  |  | $ 1,123
Scenario, Forecast [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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