Note 2 - Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net income (loss) available to common stockholders	$ (1,934)	$ 14,673
Weighted average shares outstanding
Total weighted average shares outstanding, basic (in shares)	49,625,127	45,565,381
Dilutive potential common shares (in shares)		270,742
Dilutive potential options (in shares)		36,120
Dilutive potential warrants (in shares)		1,557,100
Total weighted average shares outstanding, diluted (in shares)	49,625,127	47,429,343
Net (loss) income per share available to common stockholders
Basic (in dollars per share)	$ (0.04)	$ 0.32
Diluted (in dollars per share)	$ (0.04)	$ 0.31