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1. BASIS OF PRESENTATION AND CONSOLIDATION (Tables) | 9 Months Ended
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Sep. 30, 2017
Accounting Policies [Abstract] |
Rate of collection for accounts receivable |
Accounts Receivable Aging | Percent Collected
90-120 days | 19%
121-150 days | 34%
151-180 days | 18%
181-210 days | 34%
211-240 days | 100%
Schedule of property plant and equipment useful life |
|  | Useful life (in years)
Buildings (including salt pans) |  | 8 - 20
Plant and machinery (including protective shells, transmission channels and ducts) |  | 3 - 8
Motor vehicles |  | 5
Furniture, fixtures and equipment |  | 3-8
Schedule of earnings per share |
|  | Three-Month Period Ended September 30, |  |  | Nine-Month Period Ended September 30,
|  | 2017 |  |  | 2016 |  |  |  | 2017 |  |  |  | 2016 |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 3,425,640 |  |  | $ | 10,515,713 |  |  | $ | 25,252,438 |  |  | $ | 30,179,696 |  |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: Weighted-average common shares outstanding during the period |  |  | 46,794,443 |  |  |  | 46,301,217 |  |  |  | 46,794,011 |  |  |  | 46,106,194 |  |
Add: Dilutive effect of stock options |  |  | 103,552 |  |  |  | 8,033 |  |  |  | 39,019 |  |  |  | 454,743 |  |
Diluted |  |  | 46,897,995 |  |  |  | 46,309,250 |  |  |  | 46,833,030 |  |  |  | 46,560,937 |  |
Earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.07 |  |  | $ | 0.23 |  |  | $ | 0.54 |  |  | $ | 0.65 |  |
Diluted |  | $ | 0.07 |  |  | $ | 0.23 |  |  | $ | 0.54 |  |  | $ | 0.65 |  |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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