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Note 2 -Significant Accounting Policies - Impact of Changes to Financial Statements (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Assets                        
Contract Costs (note 11) $ 1,390               $ 1,390     $ 1,400
Total assets 339,575       $ 350,650 [1]       339,575 $ 350,650 [1]    
Liabilities and Shareholders' Equity                        
Deferred tax liability (note 9) [1] 20,925       19,834       20,925 19,834    
Retained earnings 60,810       42,676 [1]       60,810 42,676 [1]    
Total Liabilities and Shareholders' Equity 339,575       350,650 [1]       339,575 350,650 [1]    
Sales and marketing                 33,063 29,423 [2] $ 20,755 [2]  
Income before provision for income taxes                 26,155 24,075 [2] 25,113 [2]  
Provision for income tax (note 9)                 9,020 1,748 [2] 9,046 [2]  
Net income for the period 4,436 $ 5,347 $ 3,608 $ 3,744 $ 11,199 $ 3,439 $ 5,241 $ 2,446 17,135 22,327 [2],[3] 16,067 [2],[3]  
Net amortization of contract costs                 14      
Deferred income taxes (recovery)                 1,038 (3,337) [3] 1,194 [3]  
All other items                 19,022      
Net cash provided by operating activities                 37,209 $ 31,896 [3] $ 22,509 [3]  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]                        
Assets                        
Contract Costs (note 11) (1,390)               (1,390)      
Total assets (1,390)               (1,390)      
Liabilities and Shareholders' Equity                        
Deferred tax liability (note 9) (338)               (338)     (300)
Retained earnings (1,052)               (1,052)     $ (1,100)
Total Liabilities and Shareholders' Equity (1,390)               (1,390)      
Sales and marketing                 (14)      
Income before provision for income taxes                 14      
Provision for income tax (note 9)                 3      
Net income for the period                 11      
Net amortization of contract costs                 (14)      
Deferred income taxes (recovery)                 3      
All other items                      
Net cash provided by operating activities                      
Calculated under Revenue Guidance in Effect before Topic 606 [Member]                        
Assets                        
Contract Costs (note 11)                    
Total assets 338,185               338,185      
Liabilities and Shareholders' Equity                        
Deferred tax liability (note 9) 20,587               20,587      
Retained earnings 59,758               59,758      
Total Liabilities and Shareholders' Equity $ 338,185               338,185      
Sales and marketing                 33,049      
Income before provision for income taxes                 26,169      
Provision for income tax (note 9)                 9,023      
Net income for the period                 17,146      
Net amortization of contract costs                      
Deferred income taxes (recovery)                 1,041      
All other items                 19,022      
Net cash provided by operating activities                 $ 37,209      
[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.
[2] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.
[3] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.