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ORGANIZATION AND BASIS OF PRESENTATION. (Details 1) - Purchases [Member] | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Supplier A [Member] |  |  |
Concentration percentage | 17.00% | 14.00% | 13.00%
Supplier B [Member] |  |  |
Concentration percentage | 14.00% | 13.00% | 4.00%
Supplier C [Memebr] |  |  |
Concentration percentage | 11.00% | 9.00% | 13.00%
Supplier D [Memebr] |  |  |
Concentration percentage | 10.00% | 10.00% | 8.00%

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