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Note 12 - Pension and Other Postretirement Benefit Plans - Employee Pension Plan&#8217;s Assets that are Carried at Fair Value, and the Method Used to Determine Fair Value (Details) - Retirement Plan [Member] - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Pooled Separate Accounts |  |  |  |
Plan Investments |  | $ 22,419 | $ 22,702 | $ 20,146
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments |  |  | 22,702 |
Long Duration Bond Fund [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [1] | 10,045 |  |
Long Corporate Bond Fund [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [2] | 4,471 |  |
Prudential Short-term [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [3] | 360 |  |
Prudential Short-term [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [3] |  | 77 |
U.S. Large-Cap Growth [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [4] |  |  |
U.S. Large-Cap Growth [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [4] |  | 5,822 |
U.S. Large-cap Value [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [5] |  |  |
U.S. Large-cap Value [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [5] |  | 5,164 |
U.S. Small-cap Blend [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [6] |  |  |
U.S. Small-cap Blend [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [6] |  | 2,735 |
International Blend [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [7] |  |  |
International Blend [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [7] |  | 2,566 |
PIMCO Bond Fund [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [8] |  |  |
PIMCO Bond Fund [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [8] |  | 6,338 |
Investment Grade Bond Fund [Member] |  |  |  |
Pooled Separate Accounts |  |  |  |
Plan Investments | [9] | $ 7,543 |  |
[1] | Comprised of fixed income securities with durations of longer than six years that seek to maximize total return consistent with the preservation of capital and prudent investment management.
[2] | Comprised of corporate bonds with an average duration within 0.25 years of the benchmark and its average credit quality is no lower than BBB. The fund seeks to outperform the Bloomberg Barclays Long Corporate Bond Index.
[3] | Comprised of money market instruments with an emphasis on safety and liquidity.
[4] | Comprised of large-cap stocks seeking to outperform, over the long term, the Russell 1000 Growth Index. The portfolio will typically hold between 55 and 70 stocks.
[5] | Comprised of large-cap stocks seeking to outperform the Russell 1000 Value benchmark over the rolling three and five year periods, or a full market cycle, whichever is longer.
[6] | Comprised of stocks with market capitalization of between $100 million and the market capitalization of the largest stock in the Russell 2000 index at the time of purchase. The portfolio will typically hold between 40 and 100 stocks.
[7] | Comprised of non-U.S. domiciled stocks. The portfolio will typically hold between 80 and 90 stocks.
[8] | Comprised of a portfolio of fixed income securities including U.S agency mortgage-backed securities, corporate bonds, U.S. government bonds and high yield bonds.
[9] | Comprised of high quality corporate bonds diversified broadly across industries, issuers and regions. The funds primary benchmark is the Bloomberg Barclays U.S. Credit Index.

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