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Note 4 - Fair Value (Tables)
 9 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
 
 
December 31, 2016 (1)
 
 
March 31, 2016 (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)
   $
82,566
     $
82,566
     $
-
     $
115,974
     $
115,974
     $
-
  
Marketable equity securities (3)
    
2,046
      
2,046
      
-
      
1,749
      
1,749
      
-
  
Auction rate preferred securities (3)
    
350
      
-
      
350
      
350
      
-
      
350
  
Total Assets Measured at Fair Value
   $
84,962
     $
84,612
     $
350
     $
118,073
     $
117,723
     $
350