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Note 8 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]

Assets

 

Total

   

Quoted

Prices

in

Active

Markets

for

Identical

Assets

(Level 1)

   

Significant

Other

Observable

Inputs

(Level 2)

   

Significant

Unobservable

Inputs

(Level 3)

 

Money market mutual funds

  $ 26,358     $ 26,358     $     $  

Assets

 

Total

   

Quoted

Prices

in

Active

Markets

for

Identical

Assets

(Level 1)

   

Significant

Other

Observable

Inputs

(Level 2)

   

Significant

Unobservable

Inputs

(Level 3)

 

Money market mutual funds

  $ 26,356     $ 26,356     $     $