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Summary of Significant Accounting Policies (Detail Textuals) (USD $) | 12 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Significant Accounting Policies [Line Items] |  |  |
Allowance for doubtful accounts (in dollars) | $ 7,000 | $ 5,000 |
Short term investments - available for sale | 15,539,000 | 15,490,000 |
Inventory reserve | 90,000 | 79,000 |
Unrealized gain (loss) on short term investments | (35,000) | (46,000) | 75,000
Unrealized recovery of accumulated other comprehensive income |  |  | $ 110,000
Depreciation method | straight-line method |  |
Furniture, fixtures and equipment |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | three to seven years |  |
Computer software |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | three to seven years |  |
Business Concentrations | Cost of goods |  |  |
Significant Accounting Policies [Line Items] |  |  |
Number of suppliers | 5 | 5 |
Percentage products purchased from suppliers | 50.00% | 50.00% |

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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