Summary of Significant Accounting Policies, Part 2 (Details) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Cash, Cash Equivalents and Marketable Securities [Abstract]
Impairment losses for other-than-temporary decline in fair value	$ 0	$ 0	$ 0
Money market funds and debt securities	6,700,000	2,200,000
Cash and cash equivalents held in foreign bank accounts	991,000	639,000
Amortized cost and fair value of marketable securities classified as available-for-sale [Abstract]
Held-to-maturity certificates of deposit		4,180,000
Accounts Receivable [Abstract]
Allowance for doubtful accounts and sales returns	45,000	74,000
Inventories [Abstract]
Raw materials	136,000	219,000
Work-in-process	25,000	21,000
Finished goods	356,000	479,000
Inventories	517,217	718,933
US Government and Agency debt securities [Member]
Amortized cost and fair value of marketable securities classified as available-for-sale [Abstract]
Amortized Cost	3,450,000	7,209,000
Unrealized Gains	1,000	1,000
Unrealized Losses	0	(1,000)
Fair Value	3,451,000	7,209,000
Short-term Investments [Member]
Amortized cost and fair value of marketable securities classified as available-for-sale [Abstract]
Held-to-maturity certificates of deposit	0	4,200,000
Short-term Investments [Member] | US Government and Agency debt securities [Member]
Amortized cost and fair value of marketable securities classified as available-for-sale [Abstract]
Amortized Cost	3,450,000	3,756,000
Unrealized Gains	1,000	1,000
Unrealized Losses	0	0
Fair Value	3,451,000	3,757,000
Long-term Investments [Member]
Amortized cost and fair value of marketable securities classified as available-for-sale [Abstract]
Held-to-maturity certificates of deposit		0
Long-term Investments [Member] | US Government and Agency debt securities [Member]
Amortized cost and fair value of marketable securities classified as available-for-sale [Abstract]
Amortized Cost		3,453,000
Unrealized Gains		0
Unrealized Losses		(1,000)
Fair Value		3,452,000
Maturity period of available-for-sale securities	2 years
Fair Value, Measurements, Recurring [Member]
Assets carried at fair value measured on a recurring basis [Abstract]
Short-term U.S. government and agency debt securities	3,415,000	3,757,000
Long-term U.S. government and agency debt securities		3,452,000
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets carried at fair value measured on a recurring basis [Abstract]
Short-term U.S. government and agency debt securities	0	0
Long-term U.S. government and agency debt securities		0
Fair Value, Measurements, Recurring [Member] | Significant Observable Inputs (Level 2) [Member]
Assets carried at fair value measured on a recurring basis [Abstract]
Short-term U.S. government and agency debt securities	3,415,000	3,757,000
Long-term U.S. government and agency debt securities		3,452,000
Maximum period for maturity of debt securities	2 years
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets carried at fair value measured on a recurring basis [Abstract]
Short-term U.S. government and agency debt securities	0	0
Long-term U.S. government and agency debt securities		$ 0