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Note 2 - Cash and Cash Equivalents and Short-term Investments (Tables)
9 Months Ended
Sep. 30, 2012
Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block]
   
September 30, 2012
 
   
Total
Fair Value
   
Level 1
   
Level 2
   
Gross
Unrealized
Gains
(pre-tax)
   
Gross
Unrealized
Losses
(pre-tax)
 
        Mutual funds
  $ 31,779     $ 31,779     $ --     $ 487     $ --  
        Municipal bonds
    21,675       --       21,675       984       62  
Total securities available-for-sale
  $ 53,454     $ 31,779     $ 21,675     $ 1,471     $ 62  
   
December 31, 2011
 
   
Total
Fair Value
   
Level 1
   
Level 2
   
Gross
Unrealized
Gains
(pre-tax)
   
Gross
Unrealized
Losses
(pre-tax)
 
Mutual funds
  $ 24,851     $ 24,851     $ --     $ 383     $ --  
Municipal bonds
    20,004       --       20,004       617       15  
Total securities available-for-sale                                                              
  $ 44,855     $ 24,851     $ 20,004     $ 1,000     $ 15