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Note 3 - Recent Accounting Pronouncements - Impact of Changes to Financial Statements (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
 [1]
Assets            
Contract costs (note 11) $ 1,354,000   $ 1,354,000   $ 1,400,000  
Total assets 340,282,000   340,282,000     $ 350,650,000
Liabilities and Shareholders' Equity            
Deferred tax liability (note 8) 19,577,000   19,577,000     19,834,000
Retained earnings 51,027,000   51,027,000     42,676,000
Total Liabilities and Shareholders' Equity 340,282,000   340,282,000     $ 350,650,000
Sales and marketing 7,852,000 $ 7,447,000 [2] 16,217,000 $ 14,667,000 [2]    
Income before provision for income taxes 4,836,000 6,325,000 [2] 9,763,000 8,644,000 [2]    
Provision for income tax (note 8) 1,228,000 1,083,000 2,411,000 958,000    
Net income for the period 3,608,000 5,242,000 [2],[3] 7,352,000 7,686,000 [2],[3]    
Change in Capitalized Contract Costs 25,000 [3] 50,000 [3]    
Deferred income taxes (recovery) (445,000) (2,885,000) [3] (492,000) (1,565,000) [3]    
Net cash provided by operating activities 5,754,000 $ 8,131,000 [3] 15,327,000 $ 10,534,000 [3]    
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]            
Assets            
Contract costs (note 11) (1,354,000)   (1,354,000)      
Total assets (1,354,000)   (1,354,000)      
Liabilities and Shareholders' Equity            
Deferred tax liability (note 8) (329,000)   (329,000)   (300,000)  
Retained earnings (1,025,000)   (1,025,000)   $ (1,100,000)  
Total Liabilities and Shareholders' Equity (1,354,000)   (1,354,000)      
Sales and marketing (25,000)   (50,000)      
Income before provision for income taxes 25,000   50,000      
Provision for income tax (note 8) 6,000   12,000      
Net income for the period 19,000   38,000      
Change in Capitalized Contract Costs (25,000)   (50,000)      
Deferred income taxes (recovery) 6,000   12,000      
Net cash provided by operating activities 0        
Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
Assets            
Contract costs (note 11) 0   0      
Total assets 338,928,000   338,928,000      
Liabilities and Shareholders' Equity            
Deferred tax liability (note 8) 19,248,000   19,248,000      
Retained earnings 50,002,000   50,002,000      
Total Liabilities and Shareholders' Equity 338,928,000   338,928,000      
Sales and marketing 7,827,000   16,167,000      
Income before provision for income taxes 4,861,000   9,813,000      
Provision for income tax (note 8) 1,234,000   2,423,000      
Net income for the period 3,627,000   7,390,000      
Change in Capitalized Contract Costs 0   0      
Deferred income taxes (recovery) (439,000)   (480,000)      
Net cash provided by operating activities $ 5,754,000   $ 15,327,000      
[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.