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10. INCOME TAXES (Details - Income tax expense) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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 current tax |  |  |  |  |  |  |  |  | $ 871 | $ 88 | $ 237
State current tax |  |  |  |  |  |  |  |  | 4,906 | 914 | 1,705
Other current tax |  |  |  |  |  |  |  |  | 23 | 28 | 28
Federal deferred tax |  |  |  |  |  |  |  |  | 21,389 | 2,539 | 3,625
State deferred tax |  |  |  |  |  |  |  |  | (2,879) | 863 | 412
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

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- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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