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Note 12 - Earnings Per Share - Earnings Per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Net income (loss) $ (24,494,429) $ 3,584,529 $ 4,767,478 $ 4,723,263 $ (20,909,900) $ 9,490,741
Weighted average common shares (in shares) 8,486,518   8,217,822   8,434,689 8,192,533
Options to purchase common stock (in shares) 0   12,828   0 13,621
Diluted average common shares (in shares) 8,486,518   8,230,650   8,434,689 8,206,154
BASIC EARNINGS (LOSS) PER COMMON SHARE (in dollars per share) $ (2.89)   $ 0.58   $ (2.48) $ 1.16
DILUTED EARNINGS (LOSS) PER COMMON SHARE (in dollars per share) $ (2.89)   $ 0.58   $ (2.48) $ 1.16