Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Note 16 - Income Taxes (Details Textual)

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Note 16 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Unused tax credits for which no deferred tax asset recognised $ 59,000    
Applicable tax rate 26.50% 26.50% 26.50%
Unused tax credits related to research and development [Member]      
Statement Line Items [Line Items]      
Unused tax credits for which no deferred tax asset recognised $ 20,500    
Non-refundable federal investment tax credits [Member]      
Statement Line Items [Line Items]      
Unused tax credits for which no deferred tax asset recognised 4,300    
Non-refundable Ontario research and development tax credits [member]      
Statement Line Items [Line Items]      
Unused tax credits for which no deferred tax asset recognised $ 425