Note 8 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	34.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ 0
Valuation Allowance Percentage	100.00%	100.00%
Federal Income Tax Expense (Benefit), Continuing Operations, Total	$ 0
Open Tax Year	2014 2015 2016 2017 2018
Unrecognized Tax Benefits, Ending Balance	$ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	0	$ 0
State and Local Income Tax Expense (Benefit), Continuing Operations, Total	0
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	40,094,472	34,529,255
Operating Loss Carryforwards, Valuation Allowance, Total	9,603,237	8,129,778
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	12,940,458	12,261,799
Operating Loss Carryforwards, Valuation Allowance, Total	1,416,758	$ 245,812
Foreign Tax Authority [Member]
Operating Loss Carryforwards, Total	421,782
Operating Loss Carryforwards, Valuation Allowance, Total	$ 132,722