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Note 15 - Income Tax (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  | 26.50% | 26.50% |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | $ 13,325 |  |
Deferred Tax Assets, Net | $ 33,815 |  | 33,815 | $ 67,671 |
Undistributed Earnings of Foreign Subsidiaries | 42,709 |  | 42,709 | 21,886 |
Unrecognized Tax Benefits | 1,858 |  | 1,858 | 2,292 | $ 2,519
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 1,858 |  | 1,858 | 2,292 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  |  | 18 | 234 |
Recovery of Income Tax Interest and Penalties |  |  | 155 | 58 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 213 |  | 213 | $ 350 |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | $ (550) |  | $ (550) |  |
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Minimum [Member] |  |  |  |  |
Income Tax Return Examination Period |  |  | 4 years |  |
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Maximum [Member] |  |  |  |  |
Income Tax Return Examination Period |  |  | 7 years |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Minimum [Member] |  |  |  |  |
Income Tax Return Examination Period |  |  | 3 years |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Maximum [Member] |  |  |  |  |
Income Tax Return Examination Period |  |  | 5 years |  |
Foreign Tax Authority [Member] | Other Foreign Tax Authorities [Member] |  |  |  |  |
Income Tax Return Examination Period |  |  | 4 years |  |
Scenario, Forecast [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% |  |  |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -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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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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