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10. INCOME TAXES (Details - Reconciliation of the statutory U.S. federal rate and effective rates) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal tax |  |  |  |  |  |  |  |  | $ 8,971 | $ 4,229 | $ 4,979
State franchise tax, net of federal benefit |  |  |  |  |  |  |  |  | 1,799 | 224 | 1,245
Other Non deductible expenses |  |  |  |  |  |  |  |  | 91 | (11) | (1)
Changes in valuation allowance |  |  |  |  |  |  |  |  | (1,045) | 585 | (2,536)
Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  | 13,527 | 0 | 0
Deferred true-ups and other |  |  |  |  |  |  |  |  | (194) | (3,142) | 1,964
Other reconciling items |  |  |  |  |  |  |  |  | 1,161 | 2,547 | 356
Income tax expense (benefit) | $ 20,133 | $ 1,112 | $ 3,523 | $ (458) | $ 1,901 | $ 1,458 | $ 2,253 | $ (1,180) | $ 24,310 | $ 4,432 | $ 6,007
Federal tax |  |  |  |  |  |  |  |  | 34.00% | 34.00% | 34.00%
State franchise tax, net of federal benefit |  |  |  |  |  |  |  |  | 6.82% | 1.80% | 8.50%
Other Non deductible expenses |  |  |  |  |  |  |  |  | 0.35% | (0.09%) | (0.01%)
Changes in valuation allowance |  |  |  |  |  |  |  |  | (3.96%) | 4.70% | (17.32%)
Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  | 51.27% | 0.00% | 0.00%
Deferred true-ups and other |  |  |  |  |  |  |  |  | (0.74%) | (25.25%) | 13.41%
Other reconciling items |  |  |  |  |  |  |  |  | 4.39% | 20.47% | 2.43%
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 92.13% | 35.64% | 41.02%

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