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Note 10 - Accrued Expenses
12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
10.
Accrued Expenses
 
Accrued expenses consist of the following:
 
    December 31,
    2016   2015
Compensation and related expenses   $
3,089
    $
3,082
 
Facility construction costs    
804
     
415
 
Research grants    
463
     
381
 
Clinical trial costs    
227
     
252
 
Professional fees    
802
     
210
 
Deferred Rent    
231
     
-
 
Other    
880
     
438
 
Total   $
6,496
    $
4,778