Note 10 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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		34.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 586,706
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		0	0
Unrecognized Tax Benefits		$ 0	$ 0
Earliest Tax Year [Member]
Open Tax Year		2014
Latest Tax Year [Member]
Open Tax Year		2016
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards		$ 400,000
Tax Credit Carryforward, Amount		600,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards		$ 4,500,000
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%