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Consolidated Statement of Stockholders' Equity (Unaudited) - Parenthetical - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Statement of Stockholders' Equity [Abstract] |  |  |  |
Tax effect of change in post retirement benefits | $ 16,000 | $ 20,000 | $ 33,000 | $ 40,000
Unrealized Foreign Currency Hedge Gain (Loss), Tax | (174,000) | (68,000) | 186,000 | (202,000)
Unrealized Interest Rate Swap Gain (Loss), Tax | $ (14,000) | $ 106,000 | $ 164,000 | $ 164,000

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