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Note 7 - Property and Equipment
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
7. Property and Equipment

Property and equipment is stated at cost and consists of the following:

   
December 31,
 
   
2014
   
2013
 
Equipment and software
  $ 24,175,954     $ 23,326,622  
Furniture and fixtures
    1,295,847       1,316,014  
Leasehold improvements
    27,589,020       27,613,495  
Construction in progress
    558,768       157,292  
  Subtotal
    53,619,589       52,413,423  
Less accumulated depreciation
    (21,950,706 )     (19,474,712 )
  Total
  $ 31,668,883     $ 32,938,711  

Depreciation expense was $2,612,799, $2,678,745 and $2,496,749 for the years ended December 31, 2014, 2013, and 2012, respectively.