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Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unrecognized Tax Benefits |  | $ 0 | $ 0 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  | 0 | 0 |
Unrecognized Tax Benefits, Period Increase (Decrease) |  | 0 | 0 |
Current Income Tax Expense (Benefit) |  | 0 | 0 | $ 0
Deferred Income Tax Expense (Benefit) |  | $ 0 | $ 0 | $ 0
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign |  | 35.00% |  |
Operating Loss Carryforwards |  | $ 43,952 |  |
Operating Loss Carryforwards, Term |  | 20 years |  |
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Scenario, Forecast [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign | 21.00% |  |  |
Foreign Tax Authority [Member] | Australian Taxation Office [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign |  | 30.00% |  |
Foreign Tax Authority [Member] | Inland Revenue, Hong Kong [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign |  | 16.50% |  |
Foreign Tax Authority [Member] | State Administration of Taxation, China [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign |  | 25.00% |  |
Operating Loss Carryforwards |  | $ 746 |  |
Operating Loss Carryforwards, Term |  | 5 years |  |
Operating Loss Carryforwards, Amount Expire in 2022 |  | $ 746 |  |

X
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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: 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.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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