Fair Value of Financial Instruments (Details Textual)	Dec. 31, 2018
Maximum [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	6.20%
Minimum [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	3.90%

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant