Note 8 - Income Taxes (Details Textual) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 2,115,079 | |
| Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 0 | $ 0 |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 0 | 0 |
| Research Tax Credit Carryforward [Member] | ||
| Tax Credit Carryforward, Amount | 0 | $ 0 |
| Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | ||
| Operating Loss Carryforwards, Total | 49,200,000 | |
| Operating Loss Carryforwards, Subject to Expiration | 35,300,000 | |
| State and Local Jurisdiction [Member] | ||
| Operating Loss Carryforwards, Total | $ 13,200,000 |