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Note 14 - Discontinued Operations (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 25, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
MidCap Agreement [Member] | MidCap Financial [Member]          
Extinguishment of Debt, Amount $ 33.0        
Laboratory Services Business [Member]          
Proceeds from Divestiture of Businesses $ 170.0        
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Revenue   $ 1.8 $ 1.4 $ 7.3 $ 6.9
Laboratory Services Business [Member] | General and Administrative Expense [Member]          
Professional Fees   $ 2.4