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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