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Note 8 - Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
(In thousands ) |  | December 31, |
|  | 201 7 |  |  | 201 6 |
Changes in benefit obligatio n |  |  |  |  |  |  |  |
Benefit obligation at beginning of yea r |  | $ | 25,258 |  |  | $ | 24,790 |
Service cos t |  |  | 65 |  |  |  | 57 |
Interest cos t |  |  | 965 |  |  |  | 988 |
Actuarial los s |  |  | 3,755 |  |  |  | 1,288 |
Benefits pai d |  |  | (1,657 | ) |  |  | (1,865 | )
Benefit obligation at end of yea r |  |  | 28,386 |  |  |  | 25,258 |
Changes in plan asset s |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of yea r |  |  | 15,791 |  |  |  | 15,865 |
Actual return on asset s |  |  | 2,413 |  |  |  | 1,291 |
Employer contribution s |  |  | 5,598 |  |  |  | 500 |
Benefits pai d |  |  | (1,657 | ) |  |  | (1,865 | )
Fair value of plan assets at end of yea r |  |  | 22,145 |  |  |  | 15,791 |
Funded status at end of yea r |  | $ | (6,241 | ) |  | $ | (9,467 | )
Amounts recognized in consolidated balance sheet |  |  |  |  |  |  |  |
Other asset s |  | $ | 2,181 |  |  | $ | - |
Other current liabilitie s |  |  | (103 | ) |  |  | - |
Long-term pension liabilit y |  |  | (8,319 | ) |  |  | (9,467 | )
|  |  | (6,241 | ) |  |  | (9,467 | )
Amounts recognized in accumulated other comprehensive income consist of : |  |  |  |  |  |  |  |
Net actuarial los s |  | $ | 10,903 |  |  | $ | 9,819 |
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] |
|  | December 31 , |
|  | 201 7 |  |  | 201 6 |
Projected benefit obligatio n |  | $ | 28,386 |  |  | $ | 25,258 |
Fair value of plan asset s |  |  | (22,145 | ) |  |  | (15,791 | )
|  | $ | 6,241 |  |  | $ | 9,467 |
Schedule of Net Benefit Costs [Table Text Block] |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Service cost - benefits earned during the perio d |  | $ | 65 |  |  | $ | 57 |  |  | $ | 48 |
Interest cost on projected benefit obligatio n |  |  | 965 |  |  |  | 988 |  |  |  | 951 |
Expected return on plan asset s |  |  | (1,218 | ) |  |  | (1,188 | ) |  |  | (1,343 | )
Recognized actuarial los s |  |  | 1,042 |  |  |  | 1,027 |  |  |  | 772 |
Settlement los s |  |  | 435 |  |  |  | 445 |  |  |  | 460 |
Net periodic pension cost after settlement s |  | $ | 1,289 |  |  | $ | 1,329 |  |  | $ | 888 |
Schedule of Assumptions Used [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Long Term Rat e |  |  |  |  |  |  |  |  |
|  | Discount Rate |  |  | of Retur n |  |  | Salary Scale |
|  | Corp. |  |  | Plants |  |  | Corp. |  |  | Plants |  |  | Corp. |  |  | Plants |
2016 |  |  | 4.04 | % |  |  | 3.91 | % |  |  | 8.00 | % |  |  | 8.00 | % |  |  | N/A |  |  |  | N/A |
2017 |  |  | 3.53 | % |  |  | 3.45 | % |  |  | 8.00 | % |  |  | 8.00 | % |  |  | N/A |  |  |  | N/A |
|  |  |  |  |  |  |  |  |  | Long Term Rate |  |  |  |  |  |  |  |  |
|  | Discount Rate |  |  | of Retur n |  |  | Salary Scale |
|  | Corp. |  |  | Plants |  |  | Corp. |  |  | Plant s |  |  | Corp. |  |  | Plants |
2015 |  |  | 3.86 | % |  |  | 3.74 | % |  |  | 8.00 | % |  |  | 8.00 | % |  |  | N/A |  |  |  | N/A |
2016 |  |  | 4.19 | % |  |  | 4.09 | % |  |  | 8.00 | % |  |  | 8.00 | % |  |  | N/A |  |  |  | N/A |
2017 |  |  | 4.04 | % |  |  | 3.91 | % |  |  | 8.00 | % |  |  | 8.00 | % |  |  | N/A |  |  |  | N/A |
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | Percentage of Plan Assets at December 31, |  |  | Target Allocation |
Investment description |  | 201 7 |  |  | 201 6 |  |  | 201 8 |
Equity securities |  |  | 52 | % |  |  | 68 | % |  |  | 52 | %
Fixed income |  |  | 29 | % |  |  | 13 | % |  |  | 29 | %
Other |  |  | 19 | % |  |  | 19 | % |  |  | 19 | %
Total |  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
Schedule of Expected Benefit Payments [Table Text Block] |
Year |  | Projected Benefit Payments |
|  | (in thousands) |
2018 |  | $ | 1,467 |
2019 |  | $ | 1,652 |
2020 |  | $ | 2,135 |
2021 |  | $ | 1,947 |
2022 |  | $ | 1,979 |
202 3-2027 |  | $ | 8,620 |

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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