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Note 14 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Deferred Income Tax Expense (Benefit), Total   $ 0
Foreign Income Tax Expense (Benefit), Continuing Operations, Total $ 69,811 $ 67,002
Effective Income Tax Rate Reconciliation, Percent, Total (1.31%) 1.70%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 3,100,000  
Deferred Tax Assets, Valuation Allowance, Total 21,197,343 $ 18,027,787
IRC Section 382, Pre-change Losses Carryforward, Limitation, Annual 2,400,000 2,400,000
Operating Loss Carryforwards, Cumulative Amount Release From Section 382 13,300,000  
Operating Loss Carryforwards, After Change of Ownership 34,100,000  
Operating Loss Carryforwards, Subject to IRC Section 382 $ 47,400,000  
Open Tax Year 2016 2017 2018  
Federal and State [Member]    
Operating Loss Carryforwards, Total $ 73,800,000 67,300,000
Foreign Tax Authority [Member]    
Operating Loss Carryforwards, Total $ 1,900,000 $ 6,800,000