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Property and equipment
3 Months Ended
Mar. 31, 2013
Property and equipment Abstract]  
Property and equipment
Note 2. Property and equipment:
Property and equipment consisted of the following:
   
March 31,
2013
(Unaudited)
   
December 31,
2012
 
         
Land and improvements
 
$
1,107,508
   
$
1,107,508
 
Building
   
2,589,231
     
2,589,231
 
Building improvements
   
252,197
     
251,049
 
Laboratory equipment
   
1,212,668
     
1,211,418
 
Office and computer equipment
   
412,138
     
403,692
 
                 
     
5,573,742
     
5,562,898
 
Less accumulated depreciation
   
3,144,953
     
3,078,359
 
                 
   
$
2,428,789
   
$
2,484,539
 
Depreciation expense totaled approximately $67,000 and $94,000 for the three month periods ended March 31, 2013 and 2012, respectively.