Note 4 - Fair Value (Tables)

6 Months Ended

Sep. 30, 2015

Notes Tables

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

	September 30, 2015 (1)						March 31, 2015 (1)
			Fair Value Measured at Reporting Date Using						Fair Value Measured at Reporting Date Using
Description	Total		Level 1		Level 2		Total		Level 1		Level 2
	(unaudited)						(unaudited)
Assets
Money market funds (2)	$	72,444	$	72,444	$	-	$	76,317	$	76,317	$	-
Marketable equity securities (3)		1,263		1,263		-		1,737		1,737		-
Auction rate preferred securities (3)		350		-		350		350		-		350
Total Assets Measured at Fair Value	$	74,057	$	73,707	$	350	$	78,404	$	78,054	$	350
Liabilities
Derivative liabilities (4)		-		-		-		19		-		19
Total Liabilities Measured at Fair Value	$	-	$	-	$	-	$	19	$	-	$	19