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Note 15 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information (Tables)
12 Months Ended
Dec. 31, 2014
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Years Ended December 31,
 
   
2014
   
2013
   
2012
 
   
Revenue
   
Percentage of Product Revenue
   
Revenue
   
Percentage of Product Revenue
   
Revenue
   
Percentage of Product Revenue
 
Orthobiologics
  $ 61,956,870       82 %   $ 55,956,068       78 %   $ 49,954,112       74 %
Dermal
    1,334,295       2 %     1,816,602       3 %     1,384,403       2 %
Surgical
    5,854,876       8 %     5,445,715       8 %     5,022,456       7 %
Ophthalmic
    3,153,435       4 %     4,656,560       6 %     8,784,011       13 %
Veterinary
    3,174,522       4 %     3,898,785       5 %     2,865,187       4 %
    $ 75,473,998       100 %   $ 71,773,730       100 %   $ 68,010,169       100 %
Schedule of Revenue by Major Customers [Table Text Block]
   
Percentage of Product Revenue
Years Ended December 31,
 
   
2014
   
2013
   
2012
 
DePuy Mitek
    72 %     63 %     61 %
Boehringer
    4 %     5 %     4 %
Medtronic XoMEd
    4 %     3 %     3 %
Bausch & Lomb
    3 %     5 %     12 %
Nordic Pharma
    2 %     2 %     1 %
      85 %     78 %     81 %
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Years Ended December 31,
 
   
2014
   
2013
   
2012
 
   
Revenue
   
Percentage of Total Revenue
 
Revenue
   
Percentage of Total Revenue
 
Revenue
   
Percentage of Total Revenue
 
United States
  $ 92,259,139       87 %   $ 58,490,142       78 %   $ 57,976,667       81 %
Europe
    6,214,441       6 %     7,411,568       10 %     6,218,890       9 %
Other
    7,121,259       7 %     9,179,444       12 %     7,162,948       10 %
    Total
  $ 105,594,839       100 %   $ 75,081,154       100 %   $ 71,358,505       100 %
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
Years Ended December 31,
 
   
2014
   
2013
 
United States
  $ 31,058,617     $ 31,999,468  
Italy
    610,266       939,243  
  Total
  $ 31,668,883     $ 32,938,711