Note 6 - Earnings (Loss) Per Share - Earnings (Loss) Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Weighted average shares outstanding (basic) (in shares)	162,006,646	155,481,278	161,437,276	155,390,911
Dilutive shares related to warrants (in shares)			4,277,197
Unvested restricted stock (in shares)			200,000
Weighted average shares outstanding, diluted (in shares)	162,006,646	155,481,278	165,914,473	155,390,911