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Note 10 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - 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
Taxes at federal statutory rate |  |  |  |  |  |  |  |  | $ 23,147 | $ 37,106 | $ 25,681
Taxes at federal statutory rate, percentage |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
Increase (reduction) in taxes resulting from: |  |  |  |  |  |  |  |  |  |  |
State and local income tax, net of Federal income tax benefit |  |  |  |  |  |  |  |  | $ 1,410 | $ 4,890 | $ 3,461
State and local income tax, net of Federal income tax benefit, percentage |  |  |  |  |  |  |  |  | 2.10% | 4.60% | 4.70%
TCJA |  |  |  |  |  |  |  |  | $ 3,770 |  |
TCJA, percentage |  |  |  |  |  |  |  |  | 5.70% |  |
Other |  |  |  |  |  |  |  |  | $ (3,314) | $ (893) | $ (1,975)
Other, percentage |  |  |  |  |  |  |  |  | (5.00%) | (0.80%) | (2.70%)
Total provision for income taxes | $ 7,693 | $ 5,291 | $ 6,775 | $ 5,254 | $ 8,116 | $ 6,655 | $ 20,717 | $ 5,615 | $ 25,013 | $ 41,103 | $ 27,167
Taxes at effective rate, percentage |  |  |  |  |  |  |  |  | 37.80% | 38.80% | 37.00%

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 + Details
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