Note 5 - Income (Loss) Per Common Share (Details Textual) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Common Stock, Shares Authorized (in shares)	750,000,000		750,000,000		750,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.25		$ 0.25		$ 0.25
Common Stock, Shares, Issued, Total (in shares)	537,655,291		537,655,291
Treasury Stock, Shares, Ending Balance (in shares)	6,821,044		6,821,044		6,287,271
Common Stock, Shares, Outstanding, Ending Balance (in shares)	530,834,247		530,834,247
Earnings Per Share, Basic and Diluted, Total (in dollars per share)	$ (0.03)	$ (0.04)	$ (0.03)	$ (0.19)
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total (in shares)	2,499,956
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares)	1,454,246
Incremental Common Shares Attributable to Dilutive Effect of Deferred Shares (in shares)	1,996,112