Note 7 - Share-based Compensation (Tables)
12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

Options

 

Stock Options

   

Weighted
Average
Exercise
Price

   

Weighted
Average
Remaining
Contractual Term

   

Aggregate
Intrinsic Value

 

In Canadian dollars ($CDN):

                               

Outstanding at January 1, 2014

    687,533     $ 7.53                  

Granted

                           

Exercised

                           

Forfeited

    (6,666 )     8.64                  

Expired

    (508,332 )     7.42                  

Outstanding at December 31, 2014

    172,535     $ 7.80       0.37     $  

Vested or expected to vest at December 31, 2014

    172,535     $ 7.80       0.37     $  

Vested and exercisable at December 31, 2014

    172,535     $ 7.80       0.37     $  
                                 

In US dollars ($US):

                               

Outstanding at January 1, 2014

    3,727,500     $ 3.41                  

Granted

    1,444,500       1.82                  

Exercised

    (6,000 )     1.10                  

Forfeited

    (71,000 )     3.76                  

Expired

    (50,000 )     1.83                  

Outstanding at December 31, 2014

    5,045,000     $ 2.97       6.01     $ 543,010  

Vested or expected to vest at December 31, 2014

    4,938,695     $ 2.99       5.97     $ 529,330  

Vested and exercisable at December 31, 2014

    2,172,303     $ 3.96       4.35     $ 186,549  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   

2014

   

2013

   

2012

 

Weighted average grant-date fair value per stock option $US

  $ 1.24     $ 1.26     $ 3.41  

Expected dividend rate

                 

Expected volatility

    78.67 %     86.53 %     84.68 %

Risk-free interest rate

    1.65 %     1.90 %     0.89 %

Expected life of options in years

    5.82       6.0       6.0  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

Restricted Share Units

 

Restricted Share
Units

   

Weighted
Average
Fair Value per Unit

 

Outstanding at January 1, 2014

    191,613     $ 1.76  

Granted

    81,695       3.06  

Converted

    (110,104 )     3.47  

Outstanding at December 31, 2014

    163,204     $ 1.90  

Expected to vest at December 31, 2014

    163,204     $ 1.90