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Operating Leases (Details Textual)
3 Months Ended
Mar. 31, 2019
Maximum [Member]  
Percentage of Rental Escalations 10.00%
Lessee, Operating Lease, Term of Contract 2 years
Minimum [Member]  
Percentage of Rental Escalations 1.75%
Lessee, Operating Lease, Term of Contract 11 years