Note 15 - Subsequent Event (Details Textual) - USD ($) $ in Millions	Nov. 06, 2018	Sep. 25, 2018
MidCap Agreement [Member] | MidCap Financial [Member]
Extinguishment of Debt, Amount		$ 33.0
Subsequent Event [Member] | MidCap Agreement [Member] | MidCap Financial [Member]
Extinguishment of Debt, Amount	$ 33.0
Debt Instrument, Prepayment and Exit Fees	3.0
Laboratory Services Business [Member]
Proceeds from Divestiture of Businesses		$ 170.0
Laboratory Services Business [Member] | Subsequent Event [Member]
Proceeds from Divestiture of Businesses	$ 137.0