SHORT TERM INVESTMENTS (Details Textual)	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Line Items]
Maturity of Time Deposits	8 months	8 months
Minimum [Member]
Cash and Cash Equivalents [Line Items]
Percentage of Interest Bearing Bank Deposits	0.05%	0.05%
Maximum [Member]
Cash and Cash Equivalents [Line Items]
Percentage of Interest Bearing Bank Deposits	3.15%	3.15%

Period of time between issuance and maturity of customer deposits, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section V
-Paragraph D-E

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration