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Acquisition of Net Assets of a Business (Details) (Bios, USD $)
 1 Months Ended 9 Months Ended
May 31, 2012
Dec. 31, 2012
Dec. 31, 2011
May 15, 2012
Bios
        
Acquisition        
Earn-out period for determination of contingent consideration 3 years      
Minimum revenue required in three years subsequent to the acquisition for payment of contingent consideration       $ 22,127,000
Potential undiscounted future payments, low end of range       0
Potential undiscounted future payments, high end of range       6,710,000
Cash consideration       16,660,000
Contingent purchase price liability   2,140,000   2,140,000
Aggregate consideration       18,800,000
The purchase price was allocated as follows:        
Accounts receivable, net       478,000
Inventory       910,000
Other current assets       28,000
Property, plant and equipment       63,000
Intangibles       8,200,000
Goodwill       9,190,000
Current liabilities       (69,000)
Total purchase price allocation       18,800,000
Pro forma effects of the acquisition on the results of operations        
Total net revenues   34,408,000 34,036,000  
Net income   $ 5,912,000 $ 5,863,000  
Net income per common share:        
Basic (in dollars per share)   $ 1.77 $ 1.79  
Diluted (in dollars per share)   $ 1.68 $ 1.70