Note 9 - Provision for Income Taxes (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Operating Loss Carryforwards, Total	$ 58.5
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	$ 11.1
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 4.6
Net Operating Loss Carryforward Expiration Term	20 years
Valuation Allowance Percentage	100.00%