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Note 13 - Employee Retirement Plans (Details) - Weighted-average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
United States Pension Plan of US Entity [Member] |  |  |
Note 13 - Employee Retirement Plans (Details) - Weighted-average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost [Line Items] |  |  |
Discount rate | 4.24% | 4.00% | 4.75%
Rate of compensation increase | 3.50% | 3.50% | 4.00%
Discount rate | 4.00% | 4.75% | 3.75%
Expected return on plan assets | 6.00% | 6.25% | 6.00%
Rate of compensation increase | 3.50% | 4.00% | 4.00%
Foreign Pension Plan [Member] |  |  |
Note 13 - Employee Retirement Plans (Details) - Weighted-average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost [Line Items] |  |  |
Discount rate | 3.23% | 3.21% | 4.08%
Rate of compensation increase | 3.92% | 3.88% | 3.85%
Discount rate | 3.21% | 4.08% | 4.48%
Expected return on plan assets | 2.97% | 4.12% | 3.73%
Rate of compensation increase | 3.88% | 3.85% | 3.45%
Other Postretirement Benefit Plan [Member] |  |  |
Note 13 - Employee Retirement Plans (Details) - Weighted-average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost [Line Items] |  |  |
Discount rate | 4.31% | 4.00% | 4.75%
Discount rate | 4.00% | 4.75% | 4.00%

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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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