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Note 7 - Employee Benefit Plans (Details Textual) - USD ($) | 1 Months Ended | 11 Months Ended
--- | --- | ---
Jul. 31, 2016 | Feb. 29, 2016 | Dec. 31, 2016
Pension Plan [Member] | Common Stock [Member] | Subsequent Event [Member] |  |  |
Defined Benefit Plan, Contributions by Employer | $ 6,100,000 |  |
Pension Plan [Member] | Common Stock [Member] | Scenario, Forecast [Member] |  |  |
Defined Benefit Plan, Contributions by Employer |  |  | $ 0
Pension Plan [Member] |  |  |
Defined Benefit Plan, Contributions by Employer |  | $ 2,600,000 |
Unfunded Supplemental Executive Retirement Plan [Member] | Scenario, Forecast [Member] |  |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year |  |  | $ 400,000

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- Definition Amount of contributions made by the employer to defined benefit 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 35 -Paragraph 123 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937487&loc=d3e36068-114959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 63 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12551-114930 Reference 4: 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=65897934&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=65897934&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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