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Note 11 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 2.50	$ 1.80
Operating Loss Carryforwards, Expired	2,000,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total	2,700,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	6,300,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards, Total	$ 2,700,000

X

- Definition

The amount of the operating loss carryforward expired, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

No definition available.

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X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817

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-Topic 740
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-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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-Topic 740
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