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Acquisitions and Dispositions (Details) (USD $)
 0 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2013
Mar. 31, 2013
May 15, 2012
Bios
May 31, 2012
Bios
Jul. 02, 2013
ST Acquisitions
Sep. 30, 2013
ST Acquisitions
Sep. 30, 2012
ST Acquisitions
Sep. 30, 2013
ST Acquisitions
Sep. 30, 2012
ST Acquisitions
Acquisition                  
Holdback payment period from effective date, less any losses incurred by buyer, payable to seller         1 year        
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            
Estimated amount of payment resulting from contingent consideration     2,240,000            
Cash consideration     16,660,000   1,721,000        
Contingent purchase price liability     2,140,000   100,000        
Aggregate consideration     18,800,000   1,821,000        
The purchase price was allocated as follows:                  
Accounts receivable, net     478,000            
Inventories, net     910,000   230,000        
Other current assets     28,000            
Property, plant and equipment     63,000   7,000        
Intangible assets     8,200,000   1,005,000        
Goodwill 24,219,000 23,640,000 9,190,000   579,000        
Current liabilities     (69,000)            
Total purchase price allocation     18,800,000   1,821,000        
Schedule of pro forma effects of the acquisition on the results of operations                  
Total net revenue           12,676,000 11,993,000 24,311,000 22,840,000
Net income           $ 1,932,000 $ 2,370,000 $ 3,969,000 $ 4,591,000
Net Income per common share:                  
Basic (in dollars per share)           $ 0.57 $ 0.71 $ 1.17 $ 1.37
Diluted (in dollars per share)           $ 0.54 $ 0.67 $ 1.11 $ 1.30