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Note 5 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 1999
Income Tax Expense (Benefit), Continuing Operations, Global Intangible Low-taxed Income | $ 400,000 |  |
Operating Loss Carryforwards, Total | 5,400,000 |  |
Operating Loss Carryforwards, Not Subject to Expiration | 350,000 |  |
Operating Loss Carryforwards, Unused | 300,000 |  |
Operating Loss Carryforwards, Write-off | 84,000 |  |
Deferred Tax Assets, Net, Total | $ 2,568,000 | $ 3,055,000 |
Earliest Tax Year [Member] |  |  |
Open Tax Year | 2013 2014 2015 2016 2017 2018 |  |
Second Subsidiary Acquired March 2010 [Member] |  |  |
Operating Loss Carryforwards, Total |  |  | $ 300,000

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