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Acquisitions and Dispositions (Details) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Nov. 06, 2013
Amega Scientific
Dec. 31, 2013
Amega Scientific
Dec. 31, 2013
Amega Scientific
Minimum
Nov. 06, 2013
Amega Scientific
Minimum
Dec. 31, 2013
Amega Scientific
Maximum
Nov. 06, 2013
Amega Scientific
Maximum
Dec. 31, 2013
Tempsys
Nov. 06, 2013
Tempsys
May 15, 2012
Bios
May 31, 2012
Bios
Jul. 01, 2013
ST Acquisitions
Acquisition                                
Holdback payment period from effective date, less any losses incurred by buyer, payable to seller           3 years                   1 year
Earn-out period for determination of contingent consideration           3 years                 3 years  
Minimum revenue required in three years subsequent to the acquisition for payment of contingent consideration           $ 31,625,000               $ 22,127,000    
Potential undiscounted future payments, low end of range           0               0    
Potential undiscounted future payments, high end of range           10,000,000               6,710,000    
Cumulative revenue required in three years subsequent to the acquisition for payment of contingent consideration               31,625,000 31,625,000 43,500,000 43,500,000          
Estimated amount of payment resulting from contingent consideration                           2,240,000    
Cash consideration           11,268,000               16,660,000   1,721,000
Holdback payment liability           1,000,000                   100,000
Contingent consideration liability 2,676,000 2,140,000 2,676,000 2,140,000 2,140,000 500,000 500,000             2,140,000    
Aggregate consideration           12,768,000               18,800,000   1,821,000
The purchase price was allocated as follows:                                
Cash                         57,000      
Accounts receivable, net           734,000             838,000 478,000    
Inventories, net           410,000             447,000 910,000   230,000
Prepaid expenses and other           11,000             21,000      
Other current assets                           28,000    
Property, plant and equipment, net           115,000             25,000 63,000   7,000
Deferred income taxes                         585,000      
Intangibles, net           5,838,000             6,135,000 8,200,000   1,005,000
Goodwill 37,929,000   37,929,000   23,640,000 6,756,000             6,954,000 9,190,000   579,000
Accounts payable                         (255,000)      
Accrued salaries and payroll taxes           (53,000)             (2,134,000)      
Unearned revenues           (1,043,000)             (485,000)      
Other accrued expenses                         (135,000) (69,000)    
Deferred income taxes                         (2,227,000)      
Total purchase price allocation           12,768,000             9,826,000 18,800,000   1,821,000
Amount of one-time bonus accrual for employees' past services                       2,048,000        
Amount of one-time disposal of inventories related to an un-marketed product                       335,000        
Schedule of pro forma effects of the acquisition on the results of operations                                
Revenues 14,777,000 14,074,000 43,559,000 42,476,000                        
Net income $ 2,112,000 $ 2,116,000 $ 6,849,000 $ 6,982,000                        
Net Income per common share:                                
Basic (in dollars per share) $ 0.62 $ 0.63 $ 2.01 $ 2.08                        
Diluted (in dollars per share) $ 0.58 $ 0.60 $ 1.91 $ 1.98