Note 4 - Fair Value (Tables)

12 Months Ended

Mar. 31, 2016

Notes Tables

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

	March 31, 2016 (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
Assets
Money market funds (2)	$	115,974	$	115,974	$	-	$	76,317	$	76,317	$	-
Marketable equity securities (3)		1,749		1,749		-		1,737		1,737		-
Auction rate preferred securities (3)		350		-		350		350		-		350
Total Assets Measured at Fair Value	$	118,073	$	117,723	$	350	$	78,404	$	78,054	$	350
Liabilities
Derivative liabilities (4)		-		-		-		19		-		19
Total Liabilities Measured at Fair Value	$	-	$	-	$	-	$	19	$	-	$	19