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Note 11 - Income Taxes (Details Textual) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent, Total | 17.90% | 26.40% |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 35.00%
Income Taxes Receivable |  |  |  | $ 7.2
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member] |  |  |  |
Open Tax Year | 2014 |  |  |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] | Earliest Tax Year [Member] |  |  |  |
Open Tax Year | 2013 |  |  |
Scenario, Forecast [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |

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