Note 3 Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Mar. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds	$ 71,285	[1],[2]	$ 69,369	[1],[2]
Marketable Equity Securities	4,013	[1],[3]	1,064	[1],[3]
Auction Rate Preferred Securities	350	[1],[3]	350	[1],[3]
Derivative Liabilities	(275)	[1],[4]	(203)	[1],[4]
Net Assets Fair Value, Total	75,373	[1]	70,580	[1]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds	71,285	[1],[2]	69,369	[1],[2]
Marketable Equity Securities	4,013	[1],[3]	1,064	[1],[3]
Auction Rate Preferred Securities	0		0
Derivative Liabilities	0		0
Net Assets Fair Value, Total	75,298	[1]	70,433	[1]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds	0		0
Marketable Equity Securities	0		0
Auction Rate Preferred Securities	350	[1],[3]	350	[1],[3]
Derivative Liabilities	(275)	[1],[4]	(203)	[1],[4]
Net Assets Fair Value, Total	$ 75	[1]	$ 147	[1]

[1] We did not have any recurring assets whose fair value was measured using significant unobservable inputs.

[2] Included in "Cash and cash equivalents" on our unaudited condensed consolidated balance sheets.

[3] Included in "Other assets" on our unaudited condensed consolidated balance sheets.

[4] Included in "Accrued expenses and other current liabilities" on our unaudited condensed consolidated balance sheets.