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Note 4 - Cash, Cash Equivalents and Short-Term Marketable Securities (Tables)

3 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

		June 30, 2013
		Level 1				Level 2				Level 3				Total
Assets:
Money market funds		$	22,820			$	—			$	—			$	22,820				12	%
U.S. government and agency securities			20,153				20,863				—				41,016				21	%
State and local government securities			—				2,872				—				2,872				2	%
Corporate bonds and securities			—				82,675				—				82,675				43	%
Asset-backed securities			—				27,776				—				27,776				14	%
Mortgage-backed securities			—				14,994				—				14,994				8	%
Total investment assets		$	42,973			$	149,180			$	—			$	192,153				100	%

Liabilities:
Acquisition-related contingent consideration		$	—			$	—			$	10,138			$	10,138				100	%

		March 31, 2013
		Level 1				Level 2				Level 3				Total
Assets:
Money market funds		$	5,042			$	—			$	—			$	5,042				3	%
U.S. government and agency securities			22,460				19,261				—				41,721				21	%
State and local government securities			—				2,935				—				2,935				1	%
Corporate bonds and securities			274				91,955				—				92,229				47	%
Asset-backed securities			—				30,966				—				30,966				16	%
Mortgage-backed securities			—				22,736				—				22,736				12	%
Total investment assets		$	27,776			$	167,853			$	—			$	195,629				100	%

Liabilities:
Acquisition-related contingent consideration		$	—			$	—			$	10,138			$	10,138				100	%

Marketable Securities [Table Text Block]

		June 30, 2013				March 31, 2013
Cash and cash equivalents
Cash at financial institutions		$	13,638			$	9,676

Cash equivalents
Money market funds			22,820				5,042
Total cash and cash equivalents		$	36,458			$	14,718

Available-for-sale securities
U.S. government and agency securities		$	41,016			$	41,721
State and local government securities			2,872				2,935
Corporate bonds and securities			82,675				92,229
Asset-backed securities			27,776				30,966
Mortgage-backed securities			14,994				22,736
Total short-term marketable securities		$	169,333			$	190,587

Realized Gain (Loss) on Investments [Table Text Block]

		Three Months Ended
		June 30, 2013				July 1, 2012
Gross realized gains		$	218			$	240
Gross realized losses			(277	)			(278	)
Net realized losses		$	(59	)		$	(38	)

Available-for-sale Securities [Table Text Block]

		June 30, 2013
		Amortized Cost				Unrealized Gross Gains ⁽¹⁾				Unrealized Gross Losses ⁽¹⁾				Fair Value
Money market funds		$	22,820			$	—			$	—			$	22,820
U.S. government and agency securities			41,081				6				(71	)			41,016
State and local government securities			2,880				—				(8	)			2,872
Corporate bonds and securities			82,822				95				(242	)			82,675
Asset-backed securities			27,867				13				(104	)			27,776
Mortgage-backed securities			14,997				82				(85	)			14,994
Total investments		$	192,467			$	196			$	(510	)		$	192,153

		March 31, 2013
		Amortized Cost				Unrealized Gross Gains ⁽¹⁾				Unrealized Gross Losses ⁽¹⁾				Fair Value
Money market funds		$	5,042			$	—			$	—			$	5,042
U.S. government and agency securities			41,694				27				—				41,721
State and local government securities			2,927				10				(2	)			2,935
Corporate bonds and securities			92,059				215				(45	)			92,229
Asset-backed securities			30,932				61				(27	)			30,966
Mortgage-backed securities			22,646				194				(104	)			22,736
Total investments		$	195,300			$	507			$	(178	)		$	195,629

Schedule Of Amortized Cost and Fair Market Value [Table Text Block]

		June 30, 2013								March 31, 2013
		Amortized Cost				Fair Value				Amortized Cost				Fair Value
Less than 1 year		$	80,702			$	80,620			$	61,011			$	61,029
Due in 1 to 5 years			111,765				111,533				134,289				134,600
Total		$	192,467			$	192,153			$	195,300			$	195,629

Schedule of Unrealized Loss on Investments [Table Text Block]

		June 30, 2013
		Less than 12 months								12 months or greater								Total
		Fair Value				Gross Unrealized Losses				Fair Value				Gross Unrealized Losses				Fair Value				Gross Unrealized Losses
U.S. government and agency securities		$	32,973			$	(70	)		$	—			$	—			$	32,973			$	(70	)
State and local government securities			2,515				(7	)			357				(1	)			2,872				(8	)
Corporate bonds and securities			60,376				(241	)			348				(1	)			60,724				(242	)
Asset-backed securities			21,219				(94	)			828				(11	)			22,047				(105	)
Mortgage-backed securities			1,741				(19	)			3,222				(66	)			4,963				(85	)
Total		$	118,824			$	(431	)		$	4,755			$	(79	)		$	123,579			$	(510	)

			March 31, 2013
			Less than 12 months								12 months or greater								Total
			Fair Value				Gross Unrealized Losses				Fair Value				Gross Unrealized Losses				Fair Value				Gross Unrealized Losses
State and local government securities		$	—			$	—			$	404			$	(2	)		$	404			$	(2	)
Corporate bonds and securities			29,609				(42	)			497				(3	)			30,106				(45	)
Asset-backed securities			10,008				(17	)			1,241				(10	)			11,249				(27	)
Mortgage-backed securities			2,911				(39	)			3,263				(65	)			6,174				(104	)
Total		$	42,528			$	(98	)		$	5,405			$	(80	)		$	47,933			$	(178	)

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

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