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Note 5 - Income Taxes | 12 Months Ended
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Dec. 31, 2015
Notes to Financial Statements |
Income Tax Disclosure [Text Block] | 5. Income Taxes The components of the provision for income taxes consisted of the following:
(In thousands) |  | 201 5 |  |  | 2014 |  |  | 2013 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 9,280 |  |  | $ | 10,402 |  |  | $ | 15,964 |
State |  |  | 946 |  |  |  | 2,015 |  |  |  | 1,889 |
|  |  | 10,226 |  |  |  | 12,417 |  |  |  | 17,853 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 13,042 |  |  |  | 8,648 |  |  |  | 3,909 |
State |  |  | 1,678 |  |  |  | 774 |  |  |  | 394 |
|  |  | 14,720 |  |  |  | 9,422 |  |  |  | 4,303 |
Total provision |  | $ | 24,946 |  |  | $ | 21,839 |  |  | $ | 22,156 |
The statutory federal income tax rate is reconciled to the effective income tax rate as follows:
|  | 2015 |  |  | 2014 |  |  | 2013 |
Statutory federal income tax rate |  |  | 35 | % |  |  | 35 | % |  |  | 35 | %
Per diem and other non-deductible expenses |  |  | 3 |  |  |  | 4 |  |  |  | 4 |
Increase in taxes arising from state income taxes, net of federal income tax benefit |  |  | 3 |  |  |  | 3 |  |  |  | 3 |
Effective tax rate |  |  | 41 | % |  |  | 42 | % |  |  | 42 | %
As of December 31, the net deferred tax liability consisted of the following:
(In thousands) |  | 201 5 |  |  | 2014 |
Deferred tax assets: |  |  |  |  |  |  |  |
Reserves and accrued liabilities |  | $ | 7,219 |  |  | $ | 6,049 |
Other |  |  | 2,721 |  |  |  | 2,847 |
|  |  | 9,940 |  |  |  | 8,896 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Depreciation |  |  | 141,255 |  |  |  | 125,697 |
Prepaid expenses |  |  | 3,049 |  |  |  | 2,843 |
|  |  | 144,304 |  |  |  | 128,540 |
Net deferred tax liability |  | $ | 134,364 |  |  | $ | 119,644 |
We have not provided a valuation allowance against deferred tax assets at December 31, 2015 or 2014. We believe the deferred tax assets will be realized principally through future reversals of existing taxable temporary differences (deferred tax liabilities) and future taxable income. Our reserves for unrecognized tax benefits were $683,000 as of December 31, 2015 and $562,000 as of December 31, 2014. The $121,000 increase in the amount reserved in 2015 relates to current period tax positions offset by the removal of the reserve relating to 2010 tax positions. The amount reserved as of December 31, 2014 was added in 2010 through 2014 relating to current period tax positions. If recognized, $470,000 of the unrecognized tax benefits as of December 31, 2015 would impact our effective tax rate. Potential interest and penalties related to unrecognized tax benefits of $91,000 were recognized in our financial statements as of December 31, 2015, and of $72,000 were recorded as of December 31, 2014. We do not expect the reserves for unrecognized tax benefits to change significantly within the next twelve months. The federal statute of limitations remains open for 2012 and forward. We file tax returns in numerous state jurisdictions with varying statutes of limitations.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + 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 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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