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Note 16 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
    Years Ended December 31,
    2015   2014   2013
    Revenue   Percentage of Product Revenue   Revenue   Percentage of Product Revenue   Revenue   Percentage of Product Revenue
Orthobiologics   $ 73,247       84 %   $ 61,957       82 %   $ 55,956       78 %
Dermal     2,266       2 %     1,334       2 %     1,817       3 %
Surgical     5,812       7 %     5,855       8 %     5,446       8 %
Other     6,371       7 %     6,328       8 %     8,555       11 %
    $ 87,696       100 %   $ 75,474       100 %   $ 71,774       100 %
Schedule of Revenue by Major Customers [Table Text Block]
    Percentage of Product Revenue
Years Ended December 31,
    2015   2014   2013
Mitek     72 %     72 %     63 %
Boehringer     5 %     4 %     5 %
Medtronic     3 %     4 %     3 %
Nordic Pharma     2 %     2 %     2 %
Pharmascience     2 %     2 %     3 %
      84 %     84 %     76 %
Schedule of Revenue and Operating Income by Geographical Areas [Table Text Block]
    Years Ended December 31,
    2015   2014   2013
    Total
Revenue
  Percentage of
Revenue
  Total
Revenue
  Percentage of
Revenue
  Total
Revenue
  Percentage of
Revenue
Geographic Location:                                                
United States   $ 76,621       82 %   $ 92,259       87 %   $ 58,490       78 %
Europe     8,756       9 %     6,215       6 %     7,412       10 %
Other     7,622       9 %     7,121       7 %     9,179       12 %
Total   $ 92,999       100 %   $ 105,595       100 %   $ 75,081       100 %
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
    Years Ended December 31,
    2015   2014
United States   $ 39,732     $ 31,059  
Italy     376       610  
Total   $ 40,108     $ 31,669