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Note 2 - Acquisitions and Dispositions (Details Textual)
1 Months Ended 9 Months Ended
Jul. 31, 2015
Dec. 31, 2015
USD ($)
Sep. 30, 2016
Dec. 31, 2015
CAD
Dec. 31, 2015
USD ($)
Jul. 06, 2015
CAD
Jul. 06, 2015
USD ($)
Mar. 31, 2015
USD ($)
Infitrak Acquisition [Member] | Minimum [Member] | Contingent Consideration Year 1 [Member]                
Business Combination, Contingent Consideration, Sliding Scale of Growth       30.00% 30.00% 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% 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% 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% 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         10,800,000 CAD 15,000,000    
Business Combination, Contingent Consideration, Liability       CAD 9,541,000 8,700,000   $ 9,541,000  
Business Acquisition, Earn Out Period for Determination of Contingent Consideration 2 years              
Payments to Acquire Businesses, Net of Cash Acquired   $ 32,740,000            
Business Combination, Contingent Consideration, Liability         $ 4,327,000     $ 812,000