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%