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Adoption of Accounting Standards (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
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)