Note 7 - Derivative Obligations (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2016
Class of Warrant or Right, Outstanding	1,716,066	1,726,522	482,873
Derivative, Gain (Loss) on Derivative, Net, Total	$ 1,000	$ 596,000
Series A Warrant [Member]
Class of Warrant or Right, Outstanding				40,441