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Note 11 - Employee Retirement Plans (Tables) | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] |
| Pension benefits |  | Postretirement benefits
| Three months ended September 30, |  | Nine months ended September 30, |  | Three months ended September 30, |  | Nine months ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 22 |  | $ | 30 |  | $ | 67 |  | $ | 62 |  | $ | 3 |  | $ | 4 |  | $ | 10 |  | $ | 9
Interest cost |  | 36 |  |  | 42 |  |  | 109 |  |  | 118 |  |  | 8 |  |  | 10 |  |  | 24 |  |  | 28
Expected return on plan assets |  | (44) |  |  | (45) |  |  | (133) |  |  | (131) |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  | 3 |  |  |
Amortization of prior service cost (credit) |  | 2 |  |  | 1 |  |  | 5 |  |  | 4 |  |  | (2) |  |  | (3) |  |  | (5) |  |  | (5)
Recognition of actuarial loss |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total pension and postretirement benefit expense | $ | 16 |  | $ | 28 |  | $ | 56 |  | $ | 53 |  | $ | 10 |  | $ | 11 |  | $ | 32 |  | $ | 32

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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