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Note 10 - Pension and Other Postretirement Benefit Plans (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Directors' Plan [Member] |  |
Note 10 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year |  | $ 300,000
Defined Benefit Plan, Contributions by Employer | $ 100,000 |
Other Postretirement Benefit Plan [Member] |  |
Note 10 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year |  | $ 200,000
Defined Benefit Plan, Contributions by Employer | $ 49,000 |

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + 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 (b)(3) -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 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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