Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2024
Sep. 30, 2023
Stockholders' equity:    
Allowance for doubtful accounts $ 1.1 $ 1.6
Common stock, par value (in usd per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 10,000,000 10,000,000
Common stock, shares issued (in shares) 3,148,135 3,164,330
Common stock, shares outstanding (in shares) 3,148,135 3,164,330
Treasury stock (in shares) 676,258 660,063
Series E Convertible Preferred Stock    
Stockholders' equity:    
Preferred stock, par value (in usd per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 200,000 200,000
Preferred stock, shares issued (in shares) 47,840 47,840
Preferred stock, outstanding shares (in shares) 47,840 47,840
Preferred stock, liquidation preference (in usd per share) $ 0.30 $ 0.30
Treasury stock, Series E preferred (in shares) 80,000 80,000