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Note 5 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 1999
Income Tax Expense (Benefit), Continuing Operations, Global Intangible Low-taxed Income $ 500,000 $ 400,000  
Operating Loss Carryforwards, Total 3,250,000    
Operating Loss Carryforwards, Not Subject to Expiration 670,000    
Operating Loss Carryforwards, Unused   300,000  
Operating Loss Carryforwards, Write-off   84,000  
Deferred Tax Assets, Net, Total $ 1,883,000 $ 2,568,000  
Open Tax Year 2014 2015 2016 2017 2018 2019    
Second Subsidiary Acquired March 2010 [Member]      
Operating Loss Carryforwards, Total     $ 300,000