Note 14 - Loss Per Common Share - Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income (loss)	$ (16,790)	$ (99,557)	$ (26,563)
Series B Preferred Stock dividends declared	(552)	(552)	(552)
Loss applicable to common stockholders	$ (17,342)	$ (100,109)	$ (27,115)
Weighted average number of common shares outstanding – basic (in shares)	527,329	490,449	433,419
Dilutive stock options, restricted stock units, and warrants (in shares)	0	0	0
Diluted weighted average common shares (in shares)	527,329	490,449	433,419
Basic loss per common share after preferred dividends (in dollars per share)	$ (0.03)	$ (0.20)	$ (0.06)
Diluted loss per common share after preferred dividends (in dollars per share)	$ (0.03)	$ (0.20)	$ (0.06)