Annual report pursuant to Section 13 and 15(d)

Note 7 - Income Taxes (Details Textual)

v3.8.0.1
Note 7 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   34.00% 34.00%  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ 5,600,000    
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount   0 $ 600,000  
Deferred Tax Assets, Valuation Allowance   11,435,000
Unrecognized Tax Benefits   0 0  
Net Operating Loss Carryforwards Limitation on Use   1,800,000    
Remaining Preownership Net Operating Loss Carryforwards   $ 4,700,000    
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   $ 34,900,000 24,100,000  
Deferred Tax Assets, Valuation Allowance   $ 9,599,000  
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]        
Open Tax Year   2014    
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]        
Open Tax Year   2017    
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards   $ 1,400,000    
Deferred Tax Assets, Valuation Allowance   $ 1,836,000  
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] | Earliest Tax Year [Member]        
Open Tax Year   2013    
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] | Latest Tax Year [Member]        
Open Tax Year   2017    
Scenario, Forecast [Member]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%