Note 2 - Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net income (loss) available to common stockholders	$ (39,658)	$ 988	$ (41,593)	$ 15,661
Weighted average shares outstanding
Total weighted average shares outstanding, basic (in shares)	49,741,635	46,155,981	49,683,381	45,607,307
Dilutive potential common shares (in shares)	0	237,813	0	251,131
Dilutive potential options (in shares)	0	70,164	0	55,183
Dilutive potential warrants (in shares)	0	3,021,046	0	2,367,381
Total weighted average shares outstanding, diluted (in shares)	49,741,635	49,485,004	49,683,381	48,281,002
Net (loss) income per share available to common stockholders
Basic (in dollars per share)	$ (0.80)	$ 0.02	$ (0.84)	$ 0.34
Diluted (in dollars per share)	$ (0.80)	$ 0.02	$ (0.84)	$ 0.32