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Note 7 - Loan Payable (Details Textual)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 20, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
 [1]
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
 [1]
Oct. 01, 2018
Sep. 30, 2018
Jan. 24, 2018
Dec. 31, 2017
USD ($)
Jan. 19, 2017
USD ($)
Payments of Financing Costs, Total $ 600 $ 13 $ 4 $ 604          
Foreign Exchange Risk [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity   3,500   $ 3,500            
Line of Credit Facility Covenant Period       1 year 180 days            
Derivative Asset, Fair Value, Gross Asset, Total   21,600   $ 21,600            
Second Interim Amendment [Member]                    
Credit Agreement, Maximum Aggregate Amount Held in Account With Certain Bank   $ 3,000   $ 3,000            
Bank of Montreal and Royal Bank of Canada [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity $ 140,000                  
Debt Instrument, Term 4 years                  
Maximum Total Funded Debt to EBITDA Ratio 2.25         2.25 2.5      
Repayment Obligation, Percentage of Excess Cash Flow 50.00%                  
Minimum Fixed Charge Coverage Ratio   1.2   1.2            
Maximum Annual Capital Expenditures Requirement       $ 50,000            
Line of Credit Facility, Maximum Funded Share Repurchases Ceiling       20,000            
Maximum Ratio of Funded Share Repurchases to 12 Months Trailing EDITDA               1.5    
Bank of Montreal and Royal Bank of Canada [Member] | Total Loans Do Not Exceed 1.5 Times of Trailing 12 Months EBITDA [Member]                    
Line of Credit Facility, Maximum Funded Share Repurchases Ceiling       $ 40,000            
Bank of Montreal and Royal Bank of Canada [Member] | Non-revolving Facility C [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity $ 35,500                 $ 40,000
Bank of Montreal and Royal Bank of Canada [Member] | Non-revolving Facility D [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity 84,500                  
Long-term Line of Credit, Total 84,500                  
Bank of Montreal and Royal Bank of Canada [Member] | Revolving Credit Facility A [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity 5,000                  
Bank of Montreal and Royal Bank of Canada [Member] | Revolving Reducing Term Facility B [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity $ 15,000                  
Bank of Montreal and Royal Bank of Canada [Member] | Credit Facility B and C [Member] | Draws for Share Repurchases [Member]                    
Debt Instrument, Term 4 years                  
Bank of Montreal and Royal Bank of Canada [Member] | Credit Facility B and C [Member] | Draws for Acquisitions [Member]                    
Debt Instrument, Term 5 years                  
Bank of Montreal and Royal Bank of Canada [Member] | Credit Facility B and C [Member] | Draws for FFTH Capital Expenditures [Member]                    
Debt Instrument, Term 7 years                  
Bank of Nova [member] | Corporate Credit Card Program [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity                 $ 5,000  
[1] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.