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Note 2 - Purchase Price Allocation (Details) - USD ($)
 12 Months Ended
Aug. 06, 2015
Jul. 06, 2015
Oct. 15, 2014
Nov. 06, 2013
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Apr. 15, 2015
Apr. 15, 2014
Infitrak Acquisition [Member]                  
Cash consideration   $ 8,747,000              
Holdback payment liability   637,000              
Contingent consideration liability   9,271,000              
Aggregate consideration   18,655,000              
Accounts receivable   925,000              
Inventories   310,000              
Property, plant and equipment   530,000              
Intangibles   5,869,000              
Goodwill   13,833,000              
Accounts payable   (470,000)              
Accrued liabilities   (767,000)              
Deferred income taxes   (1,575,000)              
Total purchase price allocation   18,655,000              
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net   $ 18,655,000              
North Bay Acquisition [Member]                  
Cash consideration $ 10,322,000                
Holdback payment liability 1,000,000                
Aggregate consideration 11,322,000                
Accounts receivable 285,000                
Inventories 85,000                
Property, plant and equipment 229,000                
Intangibles 4,454,000                
Goodwill 7,962,000                
Accrued liabilities (100,000)                
Total purchase price allocation 11,322,000                
Cash 20,000                
Unearned revenues (1,613,000)                
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net $ 11,322,000                
PCD Acquisition [Member]                  
Cash consideration     $ 5,000,000            
Holdback payment liability     250,000            
Contingent consideration liability     300,000            
Aggregate consideration     5,550,000            
Inventories     137,000            
Property, plant and equipment     7,000            
Goodwill     1,743,000            
Total purchase price allocation     5,550,000            
Intangibles     3,678,000            
Accrued expenses     (15,000)            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net     $ 5,550,000            
BGI [Member]                  
Inventories               $ 1,268,000  
Property, plant and equipment               47,000  
Goodwill               3,295,000  
Total purchase price allocation               10,268,000 $ 10,268,000
Intangibles               5,711,000  
Accrued expenses               (53,000)  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net               $ 10,268,000 $ 10,268,000
Amega Scientific Corporation [Member]                  
Cash consideration       $ 11,268,000          
Holdback payment liability       1,000,000          
Contingent consideration liability       500,000          
Aggregate consideration       12,768,000          
Accounts receivable       663,000          
Inventories       410,000          
Property, plant and equipment       115,000          
Goodwill       6,827,000          
Total purchase price allocation       12,768,000          
Unearned revenues       (1,043,000)          
Intangibles       5,838,000          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net       12,768,000          
Prepaid expenses and other       11,000          
Accrued salaries and payroll taxes       (53,000)          
TempSys Inc [Member]                  
Accounts receivable       838,000          
Inventories       447,000          
Property, plant and equipment       25,000          
Goodwill       6,820,000          
Accounts payable       (255,000)          
Deferred income taxes       (2,093,000)          
Total purchase price allocation       9,826,000          
Cash       57,000          
Unearned revenues       (485,000)          
Intangibles       6,135,000          
Accrued expenses       (135,000)          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net       9,826,000          
Prepaid expenses and other       21,000          
Accrued salaries and payroll taxes       (2,134,000)          
Deferred income taxes       $ 585,000          
Cash consideration         $ 24,111,000 $ 20,543,000 $ 22,758,000    
Goodwill         $ 66,137,000 $ 44,869,000 $ 37,866,000