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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2021 | Sep. 30, 2021
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Condensed Consolidated Balance Sheets |  |
Accounts receivable, allowance for doubtful accounts | $ 0.8 | $ 0.9
Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Preferred stock, shares authorized (in shares) | 1,000,000 | 1,000,000
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 3,000,000 | 3,000,000
Common stock, shares outstanding (in shares) | 582,789 | 551,369

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