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Note 11 - Stockholders's Equity: (Details) - Unaudited table summarizes stockholders’ equity transactions: (USD $)
0 Months Ended 3 Months Ended 6 Months Ended
Dec. 15, 2011
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jan. 31, 2012
Note 11 - Stockholders's Equity: (Details) - Unaudited table summarizes stockholders’ equity transactions: [Line Items]            
Balances, (in Shares)   40,121,797   44,322,159   40,226,875
Balances,   $ 9,297,924   $ 10,084,417    
Balances,   28,293,757   33,931,529    
Balances,   (17,433,264)   (17,509,843)    
Balances,   (141,681)   44,104    
Balances,   20,016,736   26,550,207    
Balances, (in Shares)   40,641,488   40,641,488   40,226,875
Balances,   9,755,391   9,755,391    
Balances,   28,207,230   28,207,230    
Balances,   (16,845,634)   (16,845,634)    
Balances,   (402,622)   (402,622)    
Balances,   20,714,365   20,714,365    
Exercise of stock options (in Shares)   519,716 378,936 576,573 673,153  
Exercise of stock options   457,467   522,476    
Exercise of stock options   (177,782)   (204,282)    
Exercise of stock options   279,685   318,194    
Repurchase and retirement of shares (in Shares)     1,115,304 (4,114,121)    
Repurchase and retirement of shares (6,171,656) (259,875)   (259,875)    
Repurchase and retirement of shares       (5,454,854)    
Repurchase and retirement of shares       (6,277,741)    
Normal Course Issuer Bid (in Shares)     1,115,304 (4,114,121)    
Normal Course Issuer Bid (6,171,656) (259,875)   (259,875)    
Normal Course Issuer Bid       (5,454,854)    
Normal Course Issuer Bid       (6,277,741)    
Cancellation of restricted stock (in Shares)   (25)   (50)    
Stock-based compensation   91,255   166,097    
Stock-based compensation   91,255   166,097    
Net income for the period   587,630 695,998 664,209 2,359,617  
Net income for the period   587,630 695,998 664,209 2,359,617  
Unrealized loss on foreign currency forward contracts treated as hedges   (256,782)   (256,782)    
Unrealized loss on foreign currency forward contracts treated as hedges   (256,782)   (442,567)    
Reclassification to net income due to settlement of foreign currency forward contracts treated as hedges   (4,159)   (4,159)    
Reclassification to net income due to settlement of foreign currency forward contracts treated as hedges   (4,159)   (4,159)    
Normal Course Issuer Bid Member
           
Note 11 - Stockholders's Equity: (Details) - Unaudited table summarizes stockholders’ equity transactions: [Line Items]            
Repurchase and retirement of shares (in Shares)   (143,073)   (143,073)    
Repurchase and retirement of shares       (28,615)    
Repurchase and retirement of shares       (231,260)    
Repurchase and retirement of shares       (259,875)    
Normal Course Issuer Bid (in Shares)   (143,073)   (143,073)    
Normal Course Issuer Bid       (28,615)    
Normal Course Issuer Bid       (231,260)    
Normal Course Issuer Bid       $ (259,875)