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Note 16 - Income Taxes (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 22, 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% |  | 35.00% | 35.00% | 35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | $ (2,300) |  |  |  |
Operating Loss Carryforwards |  |  | $ 4,000 |  |
Unrecognized Tax Benefits |  |  | 0 | $ 0 |
Income Tax Expense (Benefit) |  |  | 14,386 | 18,323 | $ 17,496
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  |  | $ 647 | $ 847
Accounting Standards Update 2016-09 [Member] |  |  |  |  |
Income Tax Expense (Benefit) |  |  | $ (400) |  |
Domestic Tax Authority [Member] | Earliest Tax Year [Member] |  |  |  |  |
Open Tax Year |  |  | 2014 |  |
Domestic Tax Authority [Member] | Latest Tax Year [Member] |  |  |  |  |
Open Tax Year |  |  | 2016 |  |
Foreign Tax Authority [Member] | Earliest Tax Year [Member] |  |  |  |  |
Open Tax Year |  |  | 2011 |  |
Foreign Tax Authority [Member] | Latest Tax Year [Member] |  |  |  |  |
Open Tax Year |  |  | 2016 |  |
Scenario, Forecast [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% |  |  |

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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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