Note 6 - Fixed Assets (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leasehold Improvements, Net	$ 2.7	$ 1.5
Depreciation, Total	$ 1.3	$ 1.0	$ 0.9
Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life	10 years 292 days	11 years 292 days