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1. THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended
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Mar. 31, 2017 USD ($) subsidiary facility customer | Mar. 31, 2016 USD ($) customer | Mar. 31, 2015 USD ($) customer
Concentration of credit risk |  |  |
Allowance for doubtful accounts receivable write-offs | $ | $ 0 | $ 0 | $ 0
Basis of consolidation and risks and uncertainties |  |  |
Number of subsidiaries | subsidiary | 4 |  |
Number of principal operations near fault lines | facility | 2 |  |
Net revenue | Customer Concentration Risk |  |  |
Concentration of credit risk |  |  |
Number of customers | 4 | 4 | 3
Net revenue | Customer Concentration Risk | Customer One |  |  |
Concentration of credit risk |  |  |
Percentage attributable to customers | 26.00% | 28.00% | 35.00%
Net revenue | Customer Concentration Risk | Customer Two |  |  |
Concentration of credit risk |  |  |
Percentage attributable to customers | 20.00% | 16.00% | 13.00%
Net revenue | Customer Concentration Risk | Customer Three |  |  |
Concentration of credit risk |  |  |
Percentage attributable to customers | 20.00% | 14.00% | 12.00%
Net revenue | Customer Concentration Risk | Customer Four |  |  |
Concentration of credit risk |  |  |
Percentage attributable to customers | 10.00% | 13.00% |
Accounts receivable member | Credit Concentration Risk |  |  |
Concentration of credit risk |  |  |
Number of customers | 4 | 4 |
Accounts receivable member | Credit Concentration Risk | Customer One |  |  |
Concentration of credit risk |  |  |
Percentage attributable to customers | 36.00% | 26.00% |
Accounts receivable member | Credit Concentration Risk | Customer Two |  |  |
Concentration of credit risk |  |  |
Percentage attributable to customers | 26.00% | 25.00% |
Accounts receivable member | Credit Concentration Risk | Customer Three |  |  |
Concentration of credit risk |  |  |
Percentage attributable to customers | 13.00% | 13.00% |
Accounts receivable member | Credit Concentration Risk | Customer Four |  |  |
Concentration of credit risk |  |  |
Percentage attributable to customers | 10.00% | 11.00% |

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