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Note 10 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended | 36 Months Ended | 48 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2021
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total |  |  |  |  | $ 0
Operating Loss Carryforwards, Total |  |  |  |  | 29,455,176
Net Operating Loss That Can Be Carried Forward Indefinitely | $ 2,272,315 | $ 2,730,461 | $ 4,410,916 | $ 9,413,692 | 9,413,692
Expiring in 2021 [Member] |  |  |  |  |
Operating Loss Carryforwards, Total |  |  |  |  | $ 10,700,000

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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