Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair value measurements    
Investments available for sale $ 2,280 $ 5,677
Municipal obligations
   
Fair value measurements    
Investments available for sale 867 1,209
U.S. government security funds
   
Fair value measurements    
Investments available for sale 984 983
Short-term deposits
   
Fair value measurements    
Investments available for sale   3,104
Equity securities
   
Fair value measurements    
Investments available for sale 429 381
Recurring basis | Level 1 - Quoted Prices in Active Markets for Identical Assets
   
Fair value measurements    
Investment securities 1,346 1,429
Total assets measured at fair value on a recurring basis 2,759 2,793
Recurring basis | Level 1 - Quoted Prices in Active Markets for Identical Assets | U.S. government security funds
   
Fair value measurements    
Investments available for sale 984 983
Recurring basis | Level 1 - Quoted Prices in Active Markets for Identical Assets | Equity securities
   
Fair value measurements    
Investments available for sale 429 381
Recurring basis | Level 2 - Significant Other Observable Inputs
   
Fair value measurements    
Total assets measured at fair value on a recurring basis 867 4,313
Recurring basis | Level 2 - Significant Other Observable Inputs | Municipal obligations
   
Fair value measurements    
Investments available for sale 867 1,209
Recurring basis | Level 2 - Significant Other Observable Inputs | Short-term deposits
   
Fair value measurements    
Investments available for sale   3,104
Recurring basis | Total
   
Fair value measurements    
Investment securities 1,346 1,429
Total assets measured at fair value on a recurring basis 3,626 7,106
Recurring basis | Total | Municipal obligations
   
Fair value measurements    
Investments available for sale 867 1,209
Recurring basis | Total | U.S. government security funds
   
Fair value measurements    
Investments available for sale 984 983
Recurring basis | Total | Short-term deposits
   
Fair value measurements    
Investments available for sale   3,104
Recurring basis | Total | Equity securities
   
Fair value measurements    
Investments available for sale $ 429 $ 381