Note 4 - Fair Value (Tables)

3 Months Ended

Jun. 30, 2015

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	June 30, 2015 (1)						March 31, 2015 (1)
			Fair Value Measured at							Fair Value Measured at
			Reporting Date Using							Reporting Date Using
Description	Total		Level 1		Level 2		Total			Level 1		Level 2
	(unaudited)						(unaudited)
Money market funds (2)	$	76,027	$	76,027	$	-	$	76,317		$	76,317	$	-
Marketable equity securities (3)		1,545		1,545		-		1,737			1,737		-
Auction rate preferred securities (3)		350		-		350		350			-		350
Derivative liabilities (4)		-		-		-		(19	)		-		(19	)
Total	$	77,922	$	77,572	$	350	$	78,385		$	78,054	$	331