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, 2022	Dec. 31, 2021	Dec. 31, 2020
Net loss available to common shareholders	$ (21,749)	$ (128,969)	$ (196,242)
Weighted average outstanding shares of common stock, basic (in shares)	44,132	41,009	40,355
Dilutive effect of options, warrants and stock awards (in shares)	0	0	0
Weighted average common stock and equivalents (in shares)	44,132	41,009	40,355
Loss per share, basic (in dollars per share)	$ (0.49)	$ (3.14)	$ (4.86)
Loss per share, diluted (in dollars per share)	$ (0.49)	$ (3.14)	$ (4.86)
Incremental "in-the-money" options, warrants, and restricted stock units outstanding at the end of the period (A) (in shares)	1,863,233	2,345,948	2,235,310