Note 11 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 200,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	34.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,777,768	$ 586,706
Open Tax Year	2015 2016 2017
Unrecognized Tax Benefits, Ending Balance	$ 0	$ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total	1,000,000
Tax Credit Carryforward, Amount	500,000
Tax Credit Carryforward, Expired	100,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 6,300,000