Note 6 - Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards, Total	$ 35.1	$ 37.7
Operating Loss, Carry forwards, Expiration Term	20 years
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1.1