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Note 12 - Income Taxes (Details Textual) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Effective Income Tax Rate Reconciliation, Percent, Total | 20.30% | 19.00%
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount | $ 0.6 |
Domestic Tax Authority [Member] | California Franchise Tax Board [Member] |  |
Open Tax Year | 2016 2017 2018 2019 |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |
Open Tax Year | 2014 2015 2016 2017 2018 |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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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