Note 9 - Stockholders' Equity (Details Textual) - USD ($) shares in Thousands, $ in Thousands	6 Months Ended		23 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024	Nov. 04, 2022
Payment, Excise Tax for Repurchased Shares	$ 11,376	$ (0)
Share Repurchase Program November 2022 [Member]
Share Repurchase Program, Authorized, Amount				$ 1,500,000
Stock Repurchased During Period, Shares (in shares)	0	3,500
Stock Repurchased During Period, Value		$ 186,800
Stock Repurchased and Retired During Period, Shares (in shares)			30,000
Stock Repurchased and Retired During Period, Value			$ 1,500,000