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Income Taxes (Details - Effective Tax Rate)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]      
Federal statutory rate 35.00% 35.00% 35.00%
State income taxes, net of federal tax benefit 4.20% 3.90% 0.20%
Difference between statutory rate and foreign effective tax rate 0.00% 0.20% (2.40%)
Tax exempt income 0.00% (0.10%) (0.50%)
Disallowed executive compensation 0.10% 0.20% 6.50%
Change in valuation allowances (0.10%) (5.50%) 0.10%
Effective Income Tax Rate Reconciliation, Percentage Tax Credits (0.30%) (0.70%) (3.80%)
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent (0.30%) 0.10% 4.70%
Deferred tax adjustments (0.30%) 1.30% 3.50%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 5.50% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent (0.70%) 0.00% 0.00%
Tax on undistributed earnings and profits in certain foreign subsidiaries 0.00% 0.00% 3.90%
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent 0.00% 0.00% (241.50%)
Other (0.90%) (0.30%) (0.40%)
Effective tax rate 42.20% 34.10% (194.70%)