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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Net loss available to common shareholders $ (128,969) $ (196,242) $ (141,743)
Weighted average outstanding shares of common stock, basic (in shares) 41,008,907 40,354,638 38,204,934
Dilutive effect of options, warrants and stock awards (in shares) 0 0 0
Weighted average common stock and equivalents (in shares) 41,008,907 40,354,638 38,204,934
Loss per share, basic (in dollars per share) $ (3.14) $ (4.86) $ (3.71)
Loss per share, diluted (in dollars per share) $ (3.14) $ (4.86) $ (3.71)
In The Money Options Warrants And Restricted Stock Awards And Units [Member]      
Incremental "in-the-money" options, warrants, and restricted stock awards and units outstanding at the end of the period (A) (in shares) [1] 2,345,948 2,235,310 2,483,956
[1] For years ended December 31, 2021, 2020 and 2019 we also had 5,923,399 shares of “out-of- the-money” warrants outstanding at the end of each period.