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Organization and Summary of Significant Accounting Policies (Tables)
6 Months Ended
Aug. 31, 2015
Organization and Summary of Significant Accounting Policies [Abstract]  
Summary of available-for-sale investments
Total Face Value as of August 31, 2015 (in thousands)
Treasury bills $1,399 
Certificates of deposit  5,313 
  $6,712
Contractual maturities of available-for-sale non-equity investments
  Face value  Fair Value 
  (In thousands)  (In thousands) 
       
Maturing within one year $5,313  $5,314 
Maturing within two years  1,399   1,396 
  $6,712  $6,710