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Note 2 - Acquisitions and Dispositions - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 06, 2015
Jul. 06, 2015
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Cash consideration     $ 15,518 $ 6,800 $ 24,111
Goodwill     $ 65,543 $ 72,156 $ 66,137
Infitrak Acquisition [Member]          
Cash consideration   $ 8,747      
Holdback payment liability   637      
Contingent consideration liability   9,271      
Aggregate consideration   18,655      
Accounts receivable   925      
Inventories   310      
Property, plant and equipment   530      
Intangibles   5,869      
Goodwill   13,833      
Accounts payable   (470)      
Accrued liabilities   (767)      
Deferred income taxes   (1,575)      
Total purchase price allocation   $ 18,655      
North Bay Acquisition [Member]          
Cash consideration $ 10,322        
Holdback payment liability 1,000        
Aggregate consideration 11,322        
Accounts receivable 285        
Inventories 85        
Property, plant and equipment 229        
Intangibles 4,454        
Goodwill 7,962        
Accrued liabilities (100)        
Total purchase price allocation 11,322        
Cash 20        
Unearned revenues $ (1,613)