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Note 3 - Recent Accounting Pronouncements - Impact of Changes to Financial Statements (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Assets            
Contract Costs (note 11(a)) $ 1,383,000   $ 1,383,000   $ 1,400,000  
Total assets 337,495,000   337,495,000     $ 350,650,000 [1]
Liabilities and Shareholders' Equity            
Deferred tax liability (note 8) [1] 19,265,000   19,265,000     19,834,000
Retained earnings 56,373,000   56,373,000     42,676,000 [1]
Total Liabilities and Shareholders' Equity 337,495,000   337,495,000     $ 350,650,000 [1]
Sales and marketing 8,412,000 $ 7,384,000 [2] 24,629,000 $ 22,051,000 [2]    
Income before provision for income taxes 6,716,000 5,263,000 [2] 16,479,000 13,909,000 [2]    
Provision for income taxes (note 8) 1,370,000 1,823,000 3,781,000 2,781,000    
Net income for the period 5,346,000 3,440,000 [2],[3] 12,698,000 11,128,000 [2],[3]    
Amortization contract costs (29,000) [3] 21,000 [3]    
Deferred income taxes (recovery) (369,000) (1,445,000) [3] (861,000) (3,011,000) [3]    
Net cash provided by operating activities 11,214,000 $ 7,282,000 [3] 26,541,000 $ 17,814,000 [3]    
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]            
Assets            
Contract Costs (note 11(a)) (1,383,000)   (1,383,000)      
Total assets (1,383,000)   (1,383,000)      
Liabilities and Shareholders' Equity            
Deferred tax liability (note 8) (336,000)   (336,000)   (300,000)  
Retained earnings (1,047,000)   (1,047,000)   $ (1,100,000)  
Total Liabilities and Shareholders' Equity (1,383,000)   (1,383,000)      
Sales and marketing 29,000   (21,000)      
Income before provision for income taxes (29,000)   21,000      
Provision for income taxes (note 8) (7,000)   5,000      
Net income for the period (22,000)   16,000      
Amortization contract costs 29,000   (21,000)      
Deferred income taxes (recovery) (7,000)   5,000      
Net cash provided by operating activities        
Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
Assets            
Contract Costs (note 11(a))        
Total assets 336,112,000   336,112,000      
Liabilities and Shareholders' Equity            
Deferred tax liability (note 8) 18,929,000   18,929,000      
Retained earnings 55,326,000   55,326,000      
Total Liabilities and Shareholders' Equity 336,112,000   336,112,000      
Sales and marketing 8,441,000   24,608,000      
Income before provision for income taxes 6,687,000   16,500,000      
Provision for income taxes (note 8) 1,363,000   3,786,000      
Net income for the period 5,324,000   12,714,000      
Amortization contract costs 0        
Deferred income taxes (recovery) (376,000)   (856,000)      
Net cash provided by operating activities $ 11,214,000   $ 26,541,000      
[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.
[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.