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Note 14 - Selected Quarterly Financial Information (Unaudited) - Schedule of Selected Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
 [1]
Sep. 30, 2021
 [1]
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
 [1]
Sep. 30, 2020
 [1]
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
General and administrative expense $ 1,135 $ 1,564 $ 1,991 $ 2,463 $ 1,631 $ 2,275 $ 2,028 $ 3,532 $ 7,153 $ 9,466
Operating loss (1,135) (1,564) (1,991) (2,463) (1,631) (2,275) (2,028) (3,532) (7,153) (9,466)
Other income (loss), net (5,992) 20,588 6,733 706 (663) (820) (2,658) (3,567) 22,035 (7,708)
Interest income 79 70 74 53 52 52 52 105 276 261
Equity income (loss), net (1,586) (761) (5,136) 19,329 (5,111) (1,300) (5,277) (9,014) 11,846 (20,702)
Net loss before income taxes (8,634) 18,333 (320) 17,625 (7,353) (4,343) (9,911) (16,008) 27,004 (37,615)
Net income (loss) $ (8,634) $ 18,333 $ (320) $ 17,625 $ (7,353) $ (4,343) $ (9,911) $ (16,008) $ 27,004 $ (37,615)
Basic (in dollars per share) $ (0.51) [2] $ 0.88 [2] $ (0.02) [2] $ 0.84 [2] $ (0.35) [2] $ (0.21) [2] $ (0.48) [2] $ (0.77) [2] $ 1.36 $ (1.81)
Diluted (in dollars per share) $ (0.51) [2] $ 0.88 [2] $ (0.02) [2] $ 0.84 [2] $ (0.35) [2] $ (0.21) [2] $ (0.48) [2] $ (0.77) [2] $ 1.36 $ (1.81)
[1] The three months ended December 31, 2019 includes equity income of $1.4 million related to an equity method investment that should have been recorded during the three months ended September 30, 2019. There was no impact on the full year results.
[2] Per share amounts for the quarters have each been calculated separately. Accordingly, quarterly amounts may not add to the annual amounts because of differences in the average common shares outstanding during each period. Additionally, in regard to diluted per share amounts only, quarterly amounts may not add to the annual amounts because of the inclusion of the effect of potentially dilutive securities only in the periods in which such effect would have been dilutive, and because of the adjustments to net income (loss) for the dilutive effect of common stock equivalents and convertible securities at our ownership interests.