Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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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%