Annual report pursuant to Section 13 and 15(d)

Note 8 - Income Taxes (Details Textual)

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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Unrecognized Tax Benefits, Ending Balance $ 0 $ 0
Net Operating Loss Carryforwards Limitation on Use 1,800  
Remaining Preownership Net Operating Loss Carryforwards $ 4,700  
Minimum [Member]    
Operating Loss Carryforwards Expiration Periods 5 years  
Maximum [Member]    
Operating Loss Carryforwards Expiration Periods 20 years  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards, Total $ 38,200 $ 34,900
Operating Loss Carryforwards with Indefinite Life $ 3,400  
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Open Tax Year 2015 2016 2017 2018  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards, Total $ 1,300  
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]    
Open Tax Year 2014 2015 2016 2017 2018