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Note 7 - Loan Payable (Details Textual)
$ in Thousands
 3 Months Ended
Mar. 18, 2019
USD ($)
Jan. 20, 2017
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
 [1]
Payments of Financing Costs, Total   $ 600 $ 205 $ 4
Foreign Exchange Forward [Member]        
Derivative, Notional Amount     30,600  
Foreign Exchange Risk [Member]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 3,500  
Line of Credit Facility Covenant Period     1 year 180 days  
Bank of Montreal and Royal Bank of Canada [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 140,000    
Debt Instrument, Term   4 years    
Debt Issuance Costs, Net, Total $ 200      
Maximum Total Funded Debt to EBITDA Ratio 2.25      
Repayment Obligation, Percentage of Excess Cash Flow 50.00%      
Minimum Fixed Charge Coverage Ratio 1.2      
Maximum Annual Capital Expenditures Requirement $ 65,000      
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] | 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 6,000 15,000    
Line of Credit Facility, Increase (Decrease), Net, Total (9,000)      
Bank of Montreal and Royal Bank of Canada [Member] | Non-revolving Facility C [Member]        
Line of Credit Facility, Maximum Borrowing Capacity 44,500 35,500    
Line of Credit Facility, Increase (Decrease), Net, Total $ 9,000      
Bank of Montreal and Royal Bank of Canada [Member] | Non-revolving Facility D [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 84,500    
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      
[1] The Company has initially applied ASC 2016-02 (Topic 842) using the modified retrospective method. Under this method, the comparative information is not restated.