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Note 2 - Acquisitions and Dispositions (Details Textual)
12 Months Ended
Oct. 15, 2014
USD ($)
Nov. 06, 2013
USD ($)
Nov. 06, 2013
USD ($)
Aug. 12, 2013
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Sep. 30, 2016
Mar. 31, 2016
CAD
Mar. 31, 2016
USD ($)
Jul. 06, 2015
CAD
Jul. 06, 2015
USD ($)
Apr. 15, 2015
USD ($)
Apr. 15, 2014
USD ($)
Infitrak Acquisition [Member] | Minimum [Member] | Contingent Consideration Year 1 [Member]                            
Business Combination, Contingent Consideration, Sliding Scale of Growth                     30.00% 30.00%    
Infitrak Acquisition [Member] | Minimum [Member] | Contingent Consideration Year 2 [Member]                            
Business Combination, Contingent Consideration, Sliding Scale of Growth                     15.00% 15.00%    
Infitrak Acquisition [Member] | Maximum [Member] | Contingent Consideration Year 1 [Member]                            
Business Combination, Contingent Consideration, Sliding Scale of Growth                     70.00% 70.00%    
Infitrak Acquisition [Member] | Maximum [Member] | Contingent Consideration Year 2 [Member]                            
Business Combination, Contingent Consideration, Sliding Scale of Growth                     75.00% 75.00%    
Infitrak Acquisition [Member] | Scenario, Forecast [Member]                            
Business Combination, Contingent Consideration, Payment Installments               2            
Infitrak Acquisition [Member]                            
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low                   $ 0 CAD 0      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High                   11,500,000 CAD 15,000,000      
Business Combination, Contingent Consideration, Liability                 CAD 9,271,000 9,037,000        
Business Acquisition, Earn Out Period for Determination of Contingent Consideration         2 years                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net                       $ 18,655,000    
PCD Acquisition [Member] | Minimum [Member]                            
Business Acquisition, Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration $ 9,900,000                          
PCD Acquisition [Member] | Maximum [Member]                            
Business Acquisition, Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration 12,600,000                          
PCD Acquisition [Member]                            
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low 0                          
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 1,500,000                          
Business Combination, Contingent Consideration, Liability $ 300,000                          
Business Acquisition, Agreement Holdback, Payment Period from Effective Date Less Any Losses Incurred by Buyer Payable To Seller 3 years                          
Business Acquisition, Earn Out Period for Determination of Contingent Consideration 3 years                          
Business Combination, Payment of Contingent Consideration         $ 150,000                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net $ 5,550,000                          
BGI [Member]                            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net                         $ 10,268,000 $ 10,268,000
Amega Scientific Corporation [Member] | Minimum [Member]                            
Business Acquisition, Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration   $ 31,625,000 $ 31,625,000                      
Amega Scientific Corporation [Member] | Maximum [Member]                            
Business Acquisition, Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration   43,500,000 43,500,000                      
Amega Scientific Corporation [Member]                            
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low   0 0                      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   10,000,000 10,000,000                      
Business Combination, Contingent Consideration, Liability   $ 500,000 $ 500,000                      
Business Acquisition, Agreement Holdback, Payment Period from Effective Date Less Any Losses Incurred by Buyer Payable To Seller   3 years 3 years                      
Business Acquisition, Earn Out Period for Determination of Contingent Consideration   3 years 3 years                      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net   $ 12,768,000 $ 12,768,000                      
TempSys Inc [Member]                            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net   $ 9,826,000 $ 9,826,000                      
Nusonics Product Line Business [Member]                            
Proceeds from Divestiture of Businesses       $ 661,000                    
Disposal Group Not Discontinued Operation, Carrying Value       193,000                    
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax       $ 468,000                    
Payments to Acquire Businesses, Net of Cash Acquired         $ 33,382,000 $ 20,955,000 $ 23,258,000              
Business Combination, Contingent Consideration, Liability           $ 812,000       $ 4,430,000        
Proceeds from Divestiture of Businesses         $ 661,000