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Quarterly Information (unaudited) (Details Textual) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended
Feb. 28, 2013
Nov. 30, 2012
May 31, 2014
Navilyst [Member]
Feb. 28, 2014
Navilyst [Member]
Nov. 30, 2013
Navilyst [Member]
Aug. 31, 2013
Navilyst [Member]
May 31, 2013
Navilyst [Member]
Feb. 28, 2013
Navilyst [Member]
Nov. 30, 2012
Navilyst [Member]
Aug. 31, 2012
Navilyst [Member]
Nov. 30, 2012
Vortex Medical [Member]
May 31, 2014
Vortex Medical [Member]
May 31, 2013
Vortex Medical [Member]
Aug. 31, 2013
Clinical Devices, B.V. [Member]
Feb. 28, 2013
Vortex and Microsulis Medical Ltd [Member]
Nov. 30, 2012
Vortex Medical [Member]
Quarterly Information (Textual) [Abstract]                                
Acquisition of related cost\transaction and related costs     $ 1,300,000 $ 1,400,000 $ 1,600,000 $ 1,200,000 $ 2,100,000 $ 1,300,000 $ 1,700,000 $ 2,200,000   $ 162,000 $ 645,000 $ 300,000 $ 414,000 $ 325,000
Consolidation charges     400,000 1,000,000                        
Litigation related costs     1,100,000   800,000   580,000       425,000       901,000  
Quarterly Information (Additional Textual) [Abstract]                                
Costs related to the discontinuance of product line               1,600,000                
Transaction and related costs, UK facility 920,000 476,000         717,000     337,000            
Gain (loss) on sale of product line                     $ 770,000