Long-Term Debt (Detail Textuals) - Revolving credit facility - Option 2 - Eurodollar Borrowings	12 Months Ended
	Dec. 31, 2018 Interest_Rate
Line of Credit Facility [Line Items]
Number of credit facility interest rate	2
Description of reference rate basis	London Interbank Offering Rate ("LIBOR")
Minimum
Line of Credit Facility [Line Items]
Range of margin based on quarterly debt covenant calculation	1.125%
Maximum
Line of Credit Facility [Line Items]
Range of margin based on quarterly debt covenant calculation	2.125%