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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net loss available to common shareholders |  | $ (196,242) | $ (141,743) | $ (171,517)
Weighted average outstanding shares of common stock, basic (in shares) |  | 40,354,638 | 38,204,934 | 26,589,883
Dilutive effect of options, warrants and stock awards (in shares) |  | 0 | 0 | 0
Weighted average common stock and equivalents (in shares) |  | 40,354,638 | 38,204,934 | 26,589,883
Loss per share, basic (in dollars per share) |  | $ (4.86) | $ (3.71) | $ (6.45)
Loss per share, diluted (in dollars per share) |  | $ (4.86) | $ (3.71) | $ (6.45)
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] | 2,235,310 | 2,483,956 | 5,282,574
[1] | For years ended December 31, 2020, 2019 and 2018 we also had 5,923,399 shares of “out-of- the-money” warrants outstanding at the end of each period.

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