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Note 8 - Employee Benefit Plans (Details) - Benefit Obligation and Prepaid Benefit Costs Assumptions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Note 8 - Employee Benefit Plans (Details) - Benefit Obligation and Prepaid Benefit Costs Assumptions [Line Items] |  |  |
Discount rate: net periodic pension cost |  | 4.17% | 4.81%
Discount rate: projected benefit obligation |  | 4.45% | 4.17%
Expected rate of return on plan assets |  | 7.20% | 7.20%
Rate of compensation increase: net periodic pension cost |  | 2.00% | 4.00%
Rate of compensation increase: projected benefit obligation |  |  | 2.00%
Assumed for 2016 Through 2018 [Member] |  |  |
Note 8 - Employee Benefit Plans (Details) - Benefit Obligation and Prepaid Benefit Costs Assumptions [Line Items] |  |  |
Rate of compensation increase: projected benefit obligation | [1] | 0.00% |
Assumed for after 2018 [Member] |  |  |
Note 8 - Employee Benefit Plans (Details) - Benefit Obligation and Prepaid Benefit Costs Assumptions [Line Items] |  |  |
Rate of compensation increase: projected benefit obligation | [1] | 2.00% |
[1] | 0% is assumed for years 2016 through 2018 and 2% is assumed thereafter.

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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 interest rate used to adjust for the time value of money. + 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 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -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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