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Note 4 - Fair Value Measurements
12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Fair Value Disclosures [Text Block]
4. Fair Value Measurements

The Company’s investments are all classified within Level 2 of the fair value hierarchy. The Company’s investments classified within Level 2 of the fair value hierarchy are valued based on matrix pricing compiled by third party pricing vendors, using observable market inputs such as interest rates, yield curves, and credit risk.

The fair value hierarchy of the Company’s cash equivalents and investments at fair value is as follows:

         
Fair Value Measurements at Reporting Date Using
 
   
December 31, 2014
   
Quoted Prices in
Active Markets
for Identical Assets
(Level 1)
   
Significant Other
Observable Inputs
(Level 2)
   
Significant
Unobservable Inputs
(Level 3)
 
Cash & cash equivalents:
                       
Money market funds
  $ 69,551,754     $ -     $ 69,551,754     $ -  
Bank certificates of deposit
    3,000,000       -       3,000,000       -  
Total cash & cash equivalents
  $ 72,551,754     $ -     $ 72,551,754     $ -  
                                 
Investments:
                               
Bank certificates of deposit
  $ 6,750,000     $ -     $ 6,750,000     $ -  

         
Fair Value Measurements at Reporting Date Using
 
   
December 31, 2013
   
Quoted Prices in
Active Markets
for Identical Assets
(Level 1)
   
Significant Other
Observable Inputs
(Level 2)
   
Significant
Unobservable Inputs
(Level 3)
 
Money market funds
  $ 34,266,501     $ -     $ 34,266,501     $ -  

We did not have any transfers between Level 1 and Level 2 or transfers in or out of Level 3 of the fair value hierarchy during the years ended December 31, 2014 and 2013.