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Note 11 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 2,081,649 | $ 2,473,248
Operating Loss Carryforwards, Expired | 800,000 |
Domestic Tax Authority [Member] |  |
Operating Loss Carryforwards, Total | 8,200,000 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards, Total | 4,200,000 |
Tax Credit Carryforward, Amount | 600,000 |
Tax Credit Carryforward, Expired | 0 |
Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards, Total | $ 3,500,000 |

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- 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 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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