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Note 8 - Loan Payable (Details Textual)
$ in Thousands
 12 Months Ended
Jan. 20, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
 [1]
Oct. 01, 2018
Jan. 24, 2018
USD ($)
Jan. 19, 2017
USD ($)
Payments of Financing Costs, Total $ 600 $ 8 $ 620 [1] $ 514      
Forward Contracts [Member]              
Derivative, Notional Amount   40,500          
Foreign Exchange Risk [Member]              
Line of Credit Facility, Maximum Borrowing Capacity   $ 3,500          
Line of Credit Facility Covenant Period   1 year 180 days          
Second Interim Amendment [Member]              
Credit Agreement, Maximum Aggregate Amount Held in Account With Certain Bank           $ 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    
Repayment Obligation, Percentage of Excess Cash Flow 50.00%            
Minimum Fixed Charge Coverage Ratio 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.