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Note 15 - Pension Plan - Assets Measured at Fair Value (Details) - Pension Plan [Member] - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Fair value of plan assets | $ 37,177 | $ 38,813 | $ 33,016
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 36,260 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of plan assets |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of plan assets | 918 |  |
Equity Funds [Member] |  |  |
Fair value of plan assets | 3,146 |  |
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 3,146 |  |
US Government Agencies Debt Securities [Member] |  |  |
Fair value of plan assets | 33,022 |  |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 33,022 |  |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of plan assets |  |  |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of plan assets |  |  |
Cash [Member] |  |  |
Fair value of plan assets | 92 |  |
Cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 92 |  |
Other Plan Assets[Member] |  |  |
Fair value of plan assets | 918 |  |
Other Plan Assets[Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of plan assets | $ 918 |  |

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