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Note 11 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Reduction in Deferred Tax Assets |  | $ 1,900,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00%
Income Tax Expense (Benefit), Total | $ 0 | $ 0
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 12,300,000 |
Deferred Tax Assets, Valuation Allowance, Total | 5,312,769 | 3,089,306
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 2,200,000 | (15,500,000)
Unrecognized Tax Benefits, Ending Balance | 0 | 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 0 | $ 0
Domestic Tax Authority [Member] |  |
Operating Loss Carryforwards, Total | $ 58,200,000 |
Open Tax Year | 2012 2013 2014 2015 2016 2017 2018 |
Domestic Tax Authority [Member] | Earliest Tax Year [Member] |  |
Operating Loss Carryforwards, Expiration Year | 2029 |
Domestic Tax Authority [Member] | Latest Tax Year [Member] |  |
Operating Loss Carryforwards, Expiration Year | 2038 |

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