MARKETABLE SECURITIES (Detail Textuals) |
3 Months Ended |
|---|---|
Mar. 31, 2018 | |
| Schedule of Available-for-sale Securities [Line Items] | |
| Period of current marketable securities | less than 12 months |
| Period of non-current marketable securities | greater than 12 months |
| Maturity term of non-current marketable securities | 2019 and 2047 |
| Municipal Obligations | AA- or higher | |
| Schedule of Available-for-sale Securities [Line Items] | |
| Period of maturity debt obligations | less than one year to over 20 years |