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Operating Risk | 12 Months Ended
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Mar. 31, 2016
Risks and Uncertainties [Abstract] |
Operating Risk | 19. Operating Risk Concentrations of Credit Risk and Major Customers - A substantial percentage of the Company's sales are made to a small number of customers and are typically sold either under letter of credit or on an open account basis. Details of customers accounting for 10% or more of total net sales for each of the three years ended March 31, 2014, 2015 and 2016 are as follows:
|  | Percentage of net sales
|  | Year ended March 31,
|  | 2014 |  | 2015 |  | 2016
Customer A |  |  | 15.7 | % |  |  | * |  |  |  | 13.6 | %
Customer B |  |  | 15.8 | % |  |  | 16.5 | % |  |  | 12.7 | %
Customer C |  |  | 11.7 | % |  |  | 13.7 | % |  |  | 10.4 | %
| * | Less than 10%
Sales to the above customers relate to both injection-molded plastic parts and electronic products. Debtors accounting for 10% or more of total accounts receivable at March 31, 2015 and 2016, respectively, are as follows:
|  | Percentage of
|  | accounts
|  | receivable at
|  | March 31,
|  | 2015 |  | 2016
Customer B |  |  | 26.1% |  |  |  | 23.7% |
There were no accounts receivable written off during the years ended March 31, 2014, 2015 and 2016, respectively. There were provision for (reversal of) doubtful accounts of $(19), $73 and $274 during the years ended March 31, 2014, 2015 and 2016, respectively. There were charge off of provision for doubtful accounts of $21, $nil and $nil during the years ended March 31, 2014, 2015 and 2016, respectively. At March 31, 2015 and 2016, allowances for doubtful accounts were $607 and $881, respectively. Concentrations of Suppliers - For the years ended March 31, 2014, 2015 and 2016, the Company had no single suppliers contributed over 10% of total purchase. Country risk - The Company has significant investments in the PRC. The operating results of the Company may be adversely affected by changes in the political and social conditions in the PRC, and by changes in Chinese government policies with respect to laws and regulations, anti-inflationary measures, currency conversion and remittance abroad, and rates and methods taxation, among other things. There can be no assurance, however, those changes in political and other conditions will not result in any adverse impact. Investment price risk - The Company is exposed to equity and bond price risk on marketable and available-for-sale securities. The Company’s marketable securities are investment listed on the Stock Exchange of Hong Kong. Decisions to buy and sell securities are based on daily monitoring of the performance of individual securities compared to that of the Index and other industry indicators, as well as the Group’s liquidity needs. Listed investments held in the available-for-sale portfolio have been chosen based on their longer term growth potential and are monitored regularly for performance against expectations. The Company believes the exposure to investment price risk from the Company’s investment activities is acceptable in the Company’s circumstances.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6327-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6442-108592 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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