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Note 7 - Loan Payable (Details Textual)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 20, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
 [1]
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
 [1]
Oct. 01, 2018
Dec. 31, 2017
USD ($)
Jan. 19, 2017
USD ($)
Payments of Financing Costs, Total $ 600 $ 4 $ 16 $ 8 $ 620      
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   10,700   $ 10,700        
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 2.5   2.5   2.25    
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   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.