Note 3 - Net Loss Per Share - Calculations of Net (Loss) Income Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic and diluted, net loss attributable to Progenics	$ (18,735)	$ (13,424)
Basic and diluted, weighted average shares outstanding (in shares)	84,542	72,517
Basic and diluted, per share amount (in dollars per share)	$ (0.22)	$ (0.19)