Note 7 - (Loss) Earnings Per Share - Earnings (Loss) Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Weighted average shares outstanding, basic (in shares)	162,716,988	161,910,792	162,494,238	161,147,873
Dilutive shares related to warrants (in shares)				4,283,127
Unvested restricted stock (in shares)				200,000
Weighted average shares outstanding, diluted (in shares)	162,716,988	161,910,792	162,494,238	165,631,000