Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2024	Sep. 30, 2023
Allowance for Doubtful Accounts Receivable, Current	$ 6,507	$ 8,057
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	125,000,000	125,000,000
Common stock, issued (in shares)	63,941,421	71,294,247
Common stock, outstanding (in shares)	50,395,071	57,832,378
Treasury stock, shares (in shares)	13,546,350	13,461,869