Note 6 - Earnings (Loss) Per Share - Earnings (Loss) Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Weighted average shares outstanding (basic) (in shares)	161,910,792	155,382,368	161,147,873	155,345,231
Dilutive shares related to warrants (in shares)			4,283,127
Unvested restricted stock (in shares)			200,000
Weighted average shares outstanding, diluted (in shares)	161,910,792	155,382,368	165,631,000	155,345,231