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Note 4 - Retirement Plans (Tables) | 9 Months Ended
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Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Service cost |  | $ | 1,291 |  |  | $ | 1,243 |  |  | $ | 3,871 |  |  | $ | 3,538 |
Interest cost |  |  | 967 |  |  |  | 899 |  |  |  | 2,899 |  |  |  | 2,559 |
Expected return on plan assets |  |  | (926 | ) |  |  | (739 | ) |  |  | (2,774 | ) |  |  | (2,104 | )
Loss amortization |  |  | 824 |  |  |  | 624 |  |  |  | 2,468 |  |  |  | 1,775 |
Net periodic benefit cost |  | $ | 2,156 |  |  | $ | 2,027 |  |  | $ | 6,464 |  |  | $ | 5,768 |

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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=28361610&loc=d3e1928-114920 + Details
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