Note 5 - Employee Benefit Plans - Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Plan assets in excess of projected benefit obligation: | ||
| Projected benefit obligation | $ 5,032 | $ 4,833 |
| Fair value of plan assets | 5,356 | 4,937 |
| Accumulated benefit obligation | $ 4,510 | $ 4,366 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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