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Note 11 - Deferred Revenue (Details Textual) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2004
Feb. 28, 2004
Dec. 31, 2003
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Ortho Biotech Products LP [Member] | JNJ Agreement [Member]                    
Proceeds from Initial Payment on Licensing and Supply Agreement       $ 2.0            
Proceeds from Milestone Payments   $ 5.0 $ 20.0              
Miltek MONOVISC Agreement [Member]                    
Contract Term Years 15 years                  
Deferred Revenue $ 2.5                  
Deferred Revenue, Revenue Recognized               $ 2.2    
Revenue Recognition, Milestone Method, Revenue Recognized         $ 5.0 $ 5.0 $ 5.0 $ 17.5 $ 5.0 $ 29.7
Revenue Recognition, Milestone Method, End-user Sales                 $ 50.0