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Note 11 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
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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 |

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