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Note 16 - Income Tax (Tables)
12 Months Ended
Dec. 31, 2015
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
      2015     2014     2013
                         
Combined statutory rate     26.5 %     26.5 %     26.5 %
Permanent differences     5.8       6.4       10.4  
Tax effect of flow through entities     (2.5 )     (2.9 )     (4.5 )
Impact of changes in foreign exchange rates     (2.1 )     (0.8 )     (0.1 )
Adjustments to tax liabilities for prior periods     (1.4 )     (2.5 )     2.2  
Effects of changes in enacted tax rates     (0.5 )     0.1       -  
Changes in liability for unrecognized tax benefits     (0.6 )     (1.9 )     (0.1 )
Stock-based compensation     13.9       4.1       7.9  
Foreign, state, and provincial tax rate differential     1.1       (6.2 )     (11.0 )
Other taxes     2.4       2.4       1.6  
Change in valuation allowance     0.6       (1.7 )     (1.7 )
Outside basis difference in investments     1.4       1.4       2.2  
Other     0.3       0.3       1.7  
Effective income tax rate     44.9 %     25.2 %     35.1 %
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
      2015     2014     2013
                         
Canada   $ (31,818 )   $ (11,751 )   $ (13,300 )
United States     27,301       14,242       2,463  
Foreign     76,984       69,623       46,099  
Total   $ 72,467     $ 72,114     $ 35,262  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
      2015     2014     2013
                         
Current                        
Canada   $ (770 )   $ (6,343 )   $ (5,229 )
United States     1,555       (3,474 )     (215 )
Foreign     29,014       28,901       22,635  
      29,799       19,084       17,191  
                         
Deferred                        
Canada     (875 )     (336 )     (455 )
United States     5,980       2,728       (256 )
Foreign     (2,352 )     (3,271 )     (4,099 )
      2,753       (879 )     (4,810 )
                         
Total   $ 32,552     $ 18,205     $ 12,381  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
      2015     2014
                 
Deferred income tax assets                
Loss carry-forwards and other credits   $ 70,952     $ 76,484  
Expenses not currently deductible     22,018       23,630  
Stock-based compensation     210       696  
Investments     15,470       16,192  
Provision for doubtful accounts     3,601       2,378  
Financing fees     267       -  
Net unrealized foreign exchange losses     3,097       1,114  
      115,615       120,494  
Less: valuation allowance     (15,603 )     (14,560 )
      100,012       105,934  
                 
Deferred income tax liabilities                
Depreciation and amortization     18,932       21,880  
                 
Net deferred income tax asset   $ 81,080     $ 84,054  
Summary of Operating Loss Carryforwards [Table Text Block]
    Gross loss carry forward   Gross losses not recognized   Net
      2015     2014     2015     2014     2015     2014
                                                 
Canada   $ 49,924     $ 47,447     $ 141     $ 264     $ 49,783     $ 47,183  
United States     118,224       133,268       4,100       4,100       114,124       129,168  
Foreign     41,333       42,881       31,902       32,937       9,431       9,944  
                                                 
    Gross loss carry forward   Gross losses not recognized   Net
      2015     2014     2015     2014     2015     2014
                                                 
Canada   $ 369     $ -     $ 369     $ -     $ -     $ -  
Foreign     6,489       7,559       6,489       7,559       -       -  
Summary of Income Tax Contingencies [Table Text Block]
      2015     2014
                 
Balance, January 1   $ 3,624     $ 3,687  
Gross increases based on tax positions related to the current period     160       356  
Gross increases for tax positions of prior periods     382       1,532  
Gross decreases for tax positions of prior periods     (257 )     -  
Reduction for settlements with taxing authorities     (335 )     (1,044 )
Reduction for lapses in applicable statutes of limitations     (1,055 )     (907 )
                 
Balance, December 31   $ 2,519     $ 3,624