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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

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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