Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income (loss) available to common stockholders		$ 97,185	$ (21,749)	$ (128,969)
Weighted average outstanding shares of common stock, basic (in shares)		51,591	44,132	41,009
Dilutive effect of options, warrants and stock awards (in shares)		1,346	0	0
Weighted average common stock and equivalents (in shares)		52,937	44,132	41,009
Basic income (loss) per common share (in dollars per share)		$ 1.88	$ (0.49)	$ (3.14)
Diluted income (loss) per common share (in dollars per share)		$ 1.84	$ (0.49)	$ (3.14)
Incremental "in-the-money" options, warrants, and restricted stock units outstanding at the end of the period (A) (in shares)	[1]	1,674	1,863	2,346

[1] For years ended December 31, 2023, 2022 and 2021 we also had 861, 5,923 and 5,923 shares respectively, of “out-of- the-money” warrants outstanding at the end of each period.