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Intangible Assets (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]        
Amortization of Intangible Assets $ 58,000 $ 58,000 $ 117,000 $ 117,000