Note 7 - Income Taxes (Details Textual) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Deferred Tax Assets, Net of Valuation Allowance, Total	$ 1.4
Deferred Tax Assets, Valuation Allowance, Total	$ 10.0
Operating Loss Carryforwards, Total		$ 48.2
Operating Loss Carryforwards, Limitations on Use Amount		$ 0.1