Note 2 - Risks and Uncertainties (Details Textual) - USD ($) $ in Thousands	12 Months Ended		96 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Net Income (Loss) Attributable to Parent, Total	$ (5,905)	$ (10,374)	$ 35,100
Net Cash Provided by (Used in) Operating Activities, Total	(2,387)	(3,402)
Cash and Cash Equivalents, at Carrying Value, Ending Balance	1,405	152	1,405	$ 438
Working Capital	(1,100)		(1,100)
Debt Instrument, Unamortized Discount, Total	1,300		1,300
Stockholders' Equity Attributable to Parent, Ending Balance	$ 268	$ (3,689)	$ 268	$ (4,642)