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Fair Value Measurements (Details Textuals) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Derivative Assets $ 3,400,000 $ 3,200,000
Derivative Liabilities 1,800,000 1,100,000
Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member]    
Cash Equivalents 13,700,000 9,000,000
Change in Carrying Value Verse Fair Value of Long Term Debt 10,400,000  
Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 0 $ 0