Note 13 - Loss Per Common Share (Details Textual) - $ / shares	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Common Stock, Shares Authorized	750,000,000	750,000,000
Common Stock, Par or Stated Value Per Share	$ 0.25	$ 0.25
Common Stock, Shares, Issued, Total	529,182,994
Treasury Stock, Shares, Ending Balance	6,287,271	5,226,791
Common Stock, Shares, Outstanding, Ending Balance	522,895,723
Preferred Stock, Shares Outstanding, Ending Balance	157,816	157,816
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance	0	0	0
Class of Warrant or Right, Outstanding			0