Note 2 - Acquisitions and Dispositions (Details Textual)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 15, 2014
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CAD
Jul. 31, 2016
USD ($)
Jul. 31, 2016
CAD
Dec. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CAD
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2017
CAD
Jul. 06, 2015
USD ($)
Jul. 06, 2015
CAD
Apr. 15, 2015
USD ($)
Apr. 15, 2014
USD ($)
Business Combination, Contingent Consideration, Liability   $ 116,000         $ 116,000   $ 4,430,000            
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability             (9,554,000)   (2,058,000)          
Payments to Acquire Businesses, Net of Cash Acquired             8,622,000   33,382,000 $ 20,955,000          
Infitrak Acquisition [Member]                              
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low | CAD                         CAD 0    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | CAD                         CAD 15,000,000    
Business Combination, Contingent Consideration, Liability | CAD                     CAD 9,271,000        
Business Combination, Payment of Contingent Consideration             9,152,000 CAD 12,000,000              
Business Combination, Contingent Consideration, Earn-out Payment Amount   $ 4,558,000 CAD 6,000,000 $ 4,594,000 CAD 6,000,000                    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net                       $ 18,655,000      
Infitrak Acquisition [Member] | Contingent Consideration Year 1 [Member] | Minimum [Member]                              
Business Combination, Contingent Consideration, Sliding Scale of Growth                       30.00% 30.00%    
Infitrak Acquisition [Member] | Contingent Consideration Year 1 [Member] | Maximum [Member]                              
Business Combination, Contingent Consideration, Sliding Scale of Growth                       70.00% 70.00%    
Infitrak Acquisition [Member] | Contingent Consideration Year 2 [Member] | Minimum [Member]                              
Business Combination, Contingent Consideration, Sliding Scale of Growth                       15.00% 15.00%    
Infitrak Acquisition [Member] | Contingent Consideration Year 2 [Member] | Maximum [Member]                              
Business Combination, Contingent Consideration, Sliding Scale of Growth                       75.00% 75.00%    
PCD Acquisition [Member]                              
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, 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 Combination, Payment of Contingent Consideration                 $ 150,000            
Business Combination, Contingent Consideration, Earn-out Payment Amount           $ 450,000                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 5,550,000                            
PCD Acquisition [Member] | Other Nonoperating Income (Expense) [Member]                              
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability             $ 450,000                
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                            
BGI [Member]                              
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net                           $ 10,268,000 $ 10,268,000