Note 4 - Current and Non-Current Investments (Tables)

9 Months Ended

Sep. 30, 2013

Investments Schedule [Abstract]

Available-for-sale Securities [Table Text Block]

	September 30, 2013
(In thousands)	Cost		Unrealized Gains		Unrealized Losses			Fair Value
Current:
U.S. government securities	$	999	$	1	$	-		$	1,000
U.S. government agencies		9,069		8					9,077
Certificates of deposits		1,750		-		-			1,750
Corporate bonds		1,262		-		(1	)		1,261
Variable rate demand notes		2,175		-		-			2,175
Total	$	15,255	$	9	$	(1	)	$	15,263
Non-current:
U.S. government agencies	$	3,010	$	-	$	(1	)	$	3,009
Certificates of deposits		4,250		-		-			4,250
Total	$	7,260	$	-	$	(1	)	$	7,259

	December 31, 2012
(In thousands)	Cost		Unrealized Gains		Unrealized Losses			Fair Value
Current:
U.S. commercial paper	$	2,499	$	-	$	-		$	2,499
Municipal securities		251		-		-			251
Certificates of deposits		500		-		-			500
Variable rate demand notes		2,785		-		-			2,785
Total	$	6,035	$	-	$	-		$	6,035
Non-current:
U.S. government securities	$	10,131	$	2	$	(3	)	$	10,130
Certificates of deposits		3,000		-		-			3,000
Corporate bonds		1,281		-		(3	)		1,278
Total	$	14,412	$	2	$	(6	)	$	14,408

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

	Fair Value Measurements at Reporting Date Using
September 30, 2013 (In thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
U.S. government securities	$	-	$	1,000	$	-	$	1,000
U.S. government agencies		-		12,084				12,084
U.S. commercial paper		-		6,299		-		6,299
Certificates of deposits		-		6,000		-		6,000
Corporate bonds		-		4,012		-		4,012
Money market funds		6,012		5,115		-		11,127
Variable rate demand notes		-		2,175		-		2,175
Total assets measured at fair value	$	6,012	$	36,685	$	-	$	42,697

	Fair Value Measurements at Reporting Date Using
December 31, 2012 (In thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
U.S. government securities	$	-	$	10,130	$	-	$	10,130
U.S. commercial paper		-		5,998		-		5,998
Municipal securities		-		1,253		-		1,253
Certificates of deposits		-		3,500		-		3,500
Corporate bonds		-		6,286		-		6,286
Money market funds		16,274		-		-		16,274
Variable rate demand notes		-		2,785		-		2,785
Total assets measured at fair value	$	16,274	$	29,952	$	-	$	46,226