Annual report pursuant to Section 13 and 15(d)

Note 15 - Income Taxes (Details Textual)

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Note 15 - Income Taxes (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
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 $ 135.2  
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Operating Loss Carryforwards, Total 0.7  
Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount 19.0  
Research Tax Credit Carryforward [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Tax Credit Carryforward, Amount 0.9  
Investment Tax Credit Carryforward [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member]    
Tax Credit Carryforward, Amount $ 3.6