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Adoption of Accounting Standards (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accounting Standards Update 2017-07 [Member] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | $ 22,000 | $ (62,000) | $ 44,000 | $ (124,000)

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