Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Company's available-for-sales investments
Amortized Cost	$ 11,790
Gross Unrealized Gains	1
Gross Unrealized Losses	(5)
Fair Value	11,786
Long-term securities [Member]
Company's available-for-sales investments
Amortized Cost	6,918
Gross Unrealized Gains	1
Gross Unrealized Losses	(4)
Fair Value	6,915
Long-term securities [Member] \| Corporate notes and bonds [Member]
Company's available-for-sales investments
Amortized Cost	5,622
Gross Unrealized Gains	1
Gross Unrealized Losses	(4)
Fair Value	5,619
Long-term securities [Member] \| U.S. government and agency securities [Member]
Company's available-for-sales investments
Amortized Cost	1,296
Fair Value	1,296
Short-term securities [Member]
Company's available-for-sales investments
Amortized Cost	4,872
Gross Unrealized Gains
Gross Unrealized Losses	(1)
Fair Value	4,871
Short-term securities [Member] \| Corporate notes and bonds [Member]
Company's available-for-sales investments
Amortized Cost	1,562
Gross Unrealized Gains
Fair Value	1,562
Short-term securities [Member] \| U.S. government and agency securities [Member]
Company's available-for-sales investments
Amortized Cost	2,511
Gross Unrealized Gains
Gross Unrealized Losses	(1)
Fair Value	2,510
Short-term securities [Member] \| Commercial paper [Member]
Company's available-for-sales investments
Amortized Cost	799
Gross Unrealized Gains
Fair Value	$ 799

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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