Annual report pursuant to Section 13 and 15(d)

Note 14 - Income Taxes (Details Textual)

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Note 14 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 26.50% 26.50%
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]    
Operating Loss Carryforwards, Total $ 97,127  
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Operating Loss Carryforwards, Total 586  
Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount 18,958  
Research Tax Credit Carryforward [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Tax Credit Carryforward, Amount 557  
Investment Tax Credit Carryforward [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member]    
Tax Credit Carryforward, Amount $ 4,113