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Note 6 - Accrued Retirement Benefits (Details Textual) | 1 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Oct. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2012 a
Lipoa Point [Member] |  |  |  |
Proceeds from Sale of Productive Assets | $ 19,800,000 |  |  |
Cost of Real Estate Sales | $ 400,000 |  |  |
Minimum [Member] |  |  |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year |  | $ 0 | $ 2,800,000 |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax |  | 28,700,000 | $ 25,600,000 |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year |  | 1,000,000 |  |
Defined Benefit Plan, Additional Security to Support Unfunded Liabilities |  | 23,900,000 |  |
Defined Benefit Plan, Area of Real Estate Property Pledged as Security | a |  |  |  | 8,400
Defined Benefit Plan, Period for Release of Real Estate Property Pledged as Security |  |  |  | 5 years
Proceeds from Sale of Productive Assets |  | 52,000 |  |
Cost of Real Estate Sales |  | $ 1,759,000 | $ 1,294,000 |

X
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- Definition Represents the area of real estate property pledged as security. + References No definition available. + Details
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- Definition Reflects for the period the total of the carrying amount of the commercial, industrial and residential land and buildings sold plus certain overhead and other costs incurred to place the real estate in saleable condition, capitalized interest costs in the properties sold, and inventory impairment losses recognized. This element would most likely be used by an entity whose principal activities involve real estate or which has significant real estate operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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