Note 7 - Defined Benefit Plan - Defined Benefit Plan Activity (Details) - Pension Plan [Member] - USD ($) $ in Thousands |
9 Months Ended | |
|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Service cost | $ 522 | $ 465 |
| Interest cost | 567 | 501 |
| Expected return on plan assets | (816) | (876) |
| Amortization of prior service cost | (81) | (81) |
| Recognized net actuarial loss | 429 | 312 |
| Net periodic benefit cost | $ 621 | $ 321 |