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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Assumptions Used in Determining the Actuarial Present Value of the Accumulated Postretirement Benefit Obligations | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Rate of increase in health care costs |  |  |
Initial | 8.00% | 9.00% | 10.00%
Ultimate (year 2018) | 5.00% | 5.00% | 5.00%
Postretirement Plans [Member] |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Assumptions Used in Determining the Actuarial Present Value of the Accumulated Postretirement Benefit Obligations [Line Items] |  |  |
Rate of return on plan assets |  |  |
Discount rate | 4.06% | 3.76% |
Rate of increase in health care costs |  |  |
Annual rate of salary increase for life insurance |  |  |
Initial [Member] | Postretirement Plans [Member] |  |  |
Rate of increase in health care costs |  |  |
Initial | 7.00% | 8.00% |
Ultimate Year 2018 [Member] | Postretirement Plans [Member] |  |  |
Rate of increase in health care costs |  |  |
Ultimate (year 2018) | 5.00% | 5.00% |

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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + 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 (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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