Note 3 - Net Loss Per Share - Calculations of Net Loss Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic and diluted, net loss attributable to Progenics	$ (13,424)	$ (16,360)
Basic and diluted, weighted average shares outstanding (in shares)	72,517	70,196
Basic and diluted, per share amount (in dollars per share)	$ (0.19)	$ (0.23)