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Note 12 - Income Taxes (Details Textual) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Effective Income Tax Rate Reconciliation, Percent, Total | 21.80% | 22.80%
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Open Tax Year | 2015 2016 2017 2018 |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |
Open Tax Year | 2014 2015 2016 2017 2018 |
Restricted Stock Units (RSUs) [Member] |  |
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount | $ 0.5 |

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