Note 4 - Fair Value - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Mar. 31, 2015
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Money market funds (2)	[1],[2]	$ 76,027	$ 76,317
Marketable equity securities	[2],[3]	$ 1,545	$ 1,737
Auction rate preferred securities	[2],[3]
Derivative liabilities (4)	[2],[4]
Total	[2]	$ 77,572	$ 78,054
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Money market funds (2)	[1],[2]
Marketable equity securities	[2],[3]
Auction rate preferred securities	[2],[3]	$ 350	$ 350
Derivative liabilities (4)	[2],[4]		(19)
Total	[2]	$ 350	331
Fair Value, Measurements, Recurring [Member]
Money market funds (2)	[1],[2]	76,027	76,317
Marketable equity securities	[2],[3]	1,545	1,737
Auction rate preferred securities	[2],[3]	$ 350	350
Derivative liabilities (4)	[2],[4]		(19)
Total	[2]	$ 77,922	78,385
Marketable equity securities		1,545	1,737
Auction rate preferred securities		$ 350	$ 350

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

[2] We did not have any recurring fair value measurements of assets or liabilities whose fair value was measured using significant unobservable inputs.

[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.