Note 4 - Cash Equivalents, Short-term and Long-term Investments (Tables)

3 Months Ended

Mar. 31, 2012

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

			Gross		Gross			Estimated
	Amortized		Unrealized		Unrealized			Fair
(In thousands)	Cost		Gains		Losses			Value
March 31, 2012:
Money market funds	$	131,984	$	-	$	-		$	131,984
Corporate debt securities		37,560		70		(1	)		37,629
Commercial paper		8,997		-		-			8,997
U.S. government sponsored agency bonds		2,002		9		-			2,011
U.S. treasury securities		5,496		11		-			5,507
Total	$	186,039	$	90	$	(1	)	$	186,128
December 31, 2011:
Money market funds	$	163,368	$	-	$	-		$	163,368
Corporate debt securities		44,863		57		(43	)		44,877
Commercial paper		8,997		-		(1	)		8,996
U.S. government sponsored agency bonds		2,003		12		-			2,015
U.S. treasury securities		5,494		19		-			5,513
Total	$	224,725	$	88	$	(44	)	$	224,769

Fair Value, by Balance Sheet Grouping [Table Text Block]

Classification on Condensed Consolidated Balance Sheets:	March 31, 2012		December 31, 2011
(In thousands)
Cash equivalents	$	134,984	$	165,367
Short-term investments		46,010		42,301
Long-term investments		5,134		17,101
Total	$	186,128	$	224,769

Investments Classified by Contractual Maturity Date [Table Text Block]

Available-For-Sale Debt Securities by Contractual Maturity	March 31, 2012				December 31, 2011
(In thousands)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Less than one year	$	48,922	$	49,010	$	44,262	$	44,300
Greater than one year but less than five years		5,133		5,134		17,095		17,101
Total	$	54,055	$	54,144	$	61,357	$	61,401