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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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Amount of tax (expense) benefit from continuing operations attributable to global intangible low-taxed income.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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